How to overcome the fear of communicating with classmates?

I never understood why I feel bad every time after communicating with new people and friends. Every time I think to myself that I am stupid, unbearable, irritable, but it turns out that this is all because of school bullying.

This all lasted three and a half years. Imagine what it’s like for a child with an unstable psyche (from 12 to 15 years old) to face such a problem as bullying at school! When your classmates deliberately do not pay attention to what you do, say, and then whisper behind your back about what you did, something is wrong and giggle about it. When you look at someone with admiration and curiosity, and they respond with disgust towards you. When your things are scattered all over the office, blamed for all the problems, your property is damaged, and the teachers shrug at it.

At the moment I am studying at a university, but I am still scared, as if my classmates already hate me, despise me.

Please tell me what should I do? I won’t go to a psychologist, I can’t calmly test-antibiotic.com talk to them, plus they usually start sorting out the wrong onesproblems that concern me. There is no one to talk to, although there are a couple of friends.