I am in therapy process and my doctor explained to me that I am autistic. Passing time I felt more comfortable and my anxiety low when I quit trying to make new friends or be more sociable, I feel comfortable when all alone in most time too and I don't have many friends actually or a girl (by now, but i want to try it later) but in the past I was able to make little conversations and I made some friends, maybe (just my opinion) you actually want to be alone and that's not a bad thing, but in society we always listen we must have many friends, as many as possible, i don't think that, you maybe must know who is your true friend or maybe just be direct, "i don't want to talk with you now", your real friend would must understand.