>>85192 (OP)Realistically, you weren't gonna stick around with anyone from your school even if you were the social type. Most people at school are too absorbed in their own thing to put interactions with their friends at the pinnacle of importance, unless they are the obnoxious class clown that's severely overcompensating for something.
And the fact that you actually had the courage to cut off that psychopath in your life even if that person was particularly close to you means that you have standards about other people which are non-negotiable, and that's a good thing. The alternative is letting people in your life willy-nilly and having them ruin everything you value because sitting in silence is uncomfortable. You decided that you'd rather be sane than comfortable. That is a sign of integrity which the right people value.
The truth is that the "socialization" you did at school was never meaningful and not because you did it wrong. Everyone was there because they were born at roughly the same time and lived in roughly the same place. As such, there wasn't any choice to be at school and to interact with the people around you. You couldn't just opt out of school in order to avoid them.
If you plan on going to university, the people around you would have chosen to be there. They would have chosen to pick up knowledge and skills, they would have chosen their classes and their professors, and would have chosen to hang out with you or anyone else outside of their classes. Yes, there is still randomness with the interactions that you do have, but it's less extreme than what you experienced before.
And even if you don't go to university and decide to do something else, you're an adult now, meaning that you have agency over your own life. Adulthood brings a lot of responsibilities, but also a lot of freedoms. The people you let in your life is one of those freedoms. Cherish it.