Kind of a difficult things you wrote there.
How about not caring and getting along with people. I am going to say this right now. Stop caring and enjoy your life. Too much of anything is something that ruins your ability to perform at your job. That is simple work ethics.
Your in grade school still so getting high grades, checking out teams/clubs, and participating in etc events is what is most important asides for whatever your parents have in store for you. You have free food/clothing/shelter, free educational options, free love, and your not pass your expiration date ( I think that makes sense ). I do not want too technical on the subject but life is life. You have people who are young in Olympics, performing arts, or even taking advance classes towards a specific direction. I don't know your forte but whatever is more important then worrying about being unsociable shy geek blah blah.
Life is going to give you cards, marbles and whatever. Whatever happens happens. So stop thinking too much on the subject and just get along with the world as much as possible.
You want to be more out going ( not shy ). You can save that for experiences later in life. Getting high grades and staying healthy is what is most important. I mean it will not hurt to associate with people at all. Whatever choices you make in life is whatever choices and whatever.
Usually the way this work is that you associate with people. The people you associate with usually will change the direction of your social life. However this is not always positive in most cases. Once again this is not the end all of conversation and could go on forever. I usually suggest consulting the manual called your elders and uppers for advice.