I think I certainly developed social anxiety, from AS...essentially being treated not so kindly by other kids and some teachers due to being weird from having AS made me socially anxious because I am afraid people will judge and ridicule me. I did have some friends here and there throughout middle and highschool but not really any close ones...I've also had 'friends' that just turned out to be using me which is almost worse then not having any friends.

Also I don't think you should blame yourself for all the social deficiencies, it is not like you chose to have a disorder that effects social functioning. The only real advice I have is maybe to try and find some therapy for the social anxiety...as for getting out and making friends though I really don't have much advice for that as its something I struggle with myself.

but yeah most people I meet are pretty much through other family members, like my brother who's a few years younger has a lot of pretty open minded friends so sometimes I hang out with him and his friends.

Are there any groups or extra-cirricular activities or anything at the school you could maybe join to potentially socialize with people with simular intrests? Though depending on your level of social anxiety it might be best to take those things kind of slow so its not too overwhelming.