How Being Less Naturally Social Can Affect Your Interpersonal Success
In other articles on this site I talk about how there's nothing wrong with being less naturally social, and go over some ways less sociable people can get away with doing their own thing.
This article is coming from a more practical perspective. It's written from the view of someone who is less naturally social, but who wants to work on their people skills and make friends. The points below will cover some ways having a less social nature can get in the way of your goals.
Issues that come from having a lower drive to socialize
Lack of motivation to improve your people skills or social life
If you're less social you enjoy your own company and are usually able to fulfil yourself through any number of more solitary hobbies. The problem is this can get you stuck in annoying middle ground where you wish your social life had more going on in it, but it doesn't cause enough pain to really push you to make changes. You could finally drop in on that bridge club... but if you stayed in and watched a documentary you'd have a perfectly pleasant evening too. Your overall progress is going to more inconsistent and drawn-out. If you've also got some shyness or anxiety holding you back as well, things can really stall.
Lacking motivation to grow new friendships
New friendships take some energy to get off the ground. When you meet a prospective friend often there's an element of striking when the iron is hot; at least at first, you have to hang out with the person fairly frequently to 'lock-in' the budding relationship. The motivation of less social people to make friends may wax and wane. They may meet someone new they get along with, but then when it's time to stay in touch and organize those first few get togethers they're no longer as driven and they neglect the lead and let it go cold.
Lack of motivation to maintain existing friendships
Once a friendship is established the people in it usually form an understanding on how often they'll contact each other and hang out. Some friends see each other nearly every day. Others work fine with monthly hangouts. Whatever the amount required, a less social person may not meet it, because they don't need to hang out that often. A friendship may survive for a while this way, but eventually slip away because the other person isn't getting entirely what they need from it.
Falling behind due to accumulated lack of practice and experience
In the long term being less social affects your success by influencing how much social experience and practice with people you get. A more solitary person is going to grow up having putting in a lot less hours with their peers. His or her social skills will lag behind. They may struggle with things that other people don't even have to think about anymore. In time a vicious circle can start where the less you socialize, the less rewarding, and more discouraging it becomes, which can cause you to devote an even lower amount of time to it.
Overall I think less social people sometimes see socializing as something to do when everything else is in order, when they're in the right mood, when they have enough energy, when they have enough free time, when you have something fun enough planned, when they're not too stressed or preoccupied. In contrast, I think many people are always ready to socialize and are much less likely to put conditions on it. It can help to try to see being around people as something you can always do, not just when the stars are aligned.
On the whole I don't think there's an easy answer for these motivational issues. One thing that may help is to look at your goals and check if they're something you really want for yourself or if they're more externally imposed. Do you really need a ton more friends, or do you feel that's what you 'should' want? If it's the latter, no wonder your belly isn't full of fire to go after it. If you really do want to go after your goals, but your less social personality interferes it may just be a matter of having the self-discipline to do the things you trust will work out best for you in the long run.
This article may give you a few more ideas:
Having a low tolerance for socializing
The biggest cliche about less social people is that they get worn out really quickly when they have to be around people. I think this is due to a combination of inborn and learned factors. They may have a naturally less social personality, but they may also just not be as used to socializing, and therefore get more drained and irked by it. Whatever the cause, it adds up to that well-known sensation of feeling tired and wanting to go home after a few hours.
On the whole you can accommodate this tendency by only socializing as much as you want to, and taking enough time to recharge. It can be inconvenient to get drained too quickly though. There are times when you'll want to be able to stick around somewhere longer, and don't want to give into the voices telling you it's time to go home. I give some thoughts on dealing with this common issue in this article:
Possibly going a bit off from spending too much time alone
I already covered how spending time on your own can lead you to miss out on social experience. It doesn't always happen, but spending too much time alone can also make you become a bit odd and out of touch with everyone else in a hundred tiny, subtle ways. It's nothing dramatic, but you're that half beat behind the rest of the world, and your social interactions can suffer as a result. I find that if you've already developed decent social skills you can spend time alone without them degrading too much. However, if you're more on the awkward side then isolation may push you even further in that direction.
I find the rest of humanity as a whole serves as a check for people's odder traits. Everyone develops their own strange little habits and opinions. I don't mean legitimately unique, fun differences, more quirks anyone would automatically dismiss as weird and useless. When you spend too much time alone these little idiosyncrasies can grow and multiply unimpeded. When you're around other people, they get regularly pruned back. You make an inappropriate joke and your friends look at you funny. You share a dopey opinion and they immediately give you a reason why it's wrong. You start acting strange and they tell you to cut it out. Everyone acts as everyone else's social "polisher."
Not liking the things most people like
This whole article has a pragmatic slant to it, but this point especially. Less social people often have interests that differ from what most people are into. They're into esoteric, solitary, cerebral pursuits. Everyone else seems to like noisy, physical, group activities. When they find themselves in a group, more often than not everyone's doing something they aren't that good at, and which they don't particularly enjoy. Socializing with many types of people obviously becomes less fun.
One thing that can help is to make an effort to get into some of the things most people enjoy. I don't mean totally changing, that's not possible or something you'd want to do, but just taking on additional skills, experiences, and knowledge here and there to make things go more smoothly: Giving that video game all your friends play a shot, getting familiar with certain popular topics, learning to dance, etc.
Being too picky about the people you hang around
Less social people are often more selective about who they choose to spend their time with. This is understandable because they may have somewhat unique personalities which won't gel with just anyone's. Also, they often have a "quality over quantity" mindset. They don't need to socialize for as many hours each week, and they often have a lower tolerance for the little hassles of socializing, so they'd prefer to have a few really compatible friends than a ton of so-so ones.
The problem is when you want to make more friends, but your pickiness kicks into too strongly and you end up turning away people who would have become good friends or acquaintances if given a chance. If you turn away too many potential friends then you'll end up with no social life at all. Especially when you're first forming a social circle, you're not totally sure what you like and want in other people, so you have to give them some time to prove themselves.
Coming across as anti-social or that you don't like people
Even though someone may just be reserved, keep to themselves, or enjoy solitary pursuits, if they give the impression that they don't like other people, and that they don't want to spend time with them, they can be viewed quite negatively. People don't like the idea that someone dislikes them. It's not accurate, but to many people, someone just wanting to do their own thing translates into a personal rejection. Not everyone has an easy time wrapping their heads around the fact that some of us just don't want to be sociable all the time due to their basic nature.
If you give off that vibe, but to do better with people, it can help to consciously adopt some behaviors that send more of a friendly message.