Is it normal schools bully introverted children

When I was in school I was lonely. I got teased by the girls in my class for not having all the latest stuff and for being quiet but at first I didnt care because I enjoyed being alone.
Then teachers started to tear me down over it. They were the real bullies, actually. At teacher parent talks they would always ask me "do you have any friends? where do they live?" and other invasive questions. I did not have friends but it didnt bother me, however it made me feel really weird and guilty that I didnt because the teachers kept asking like something was seriously wrong with me.

Then when we got old enough to go eat lunch alone without our teacher I would walk to the lunch by myself. Mom told me to stop walking alone because I look like a victim. Grandma would keep an eye on me through her window everyday to make sure I didnt look pathetic and lonely.

As a result I started to ask different friend groupings of girls in my class if I was allowed to walk with them. Often they would say "fine" and let me. Eventually they started saying no. It made me panic since I would obviously shame my family if I walked alone so i'd walk with them. That ramped things up, they'd some days start running or they'd yell at me to leave them alone or they'd steal my jacket or mittens and throw in the ditch to stall me. The teachers would tell me to start being like everyone else and to toughen up. One time a teacher I had grabbed me by the arm when I was standing at my locker and pulled me away from it then she said "youre coming with me to the school counsellor, you need help" and her reasoning was I was a quiet person who "looked depressed". I refused and eventually she let me go.

Luckily everyone else at school was nice to me and didnt seem to find me weird but I was too ashamed to request to switch to a different class, plus the girls in mine had this weird idea that I didnt talk because I considered myself 'above them' hence if I had switched to a different class they wouldve gotten meaner because they'd have it confirmed, in their minds, that I felt I was too good for them. They were insecure. They were frenemies who tore each other down. They tried to "encruit" me sometimes by inviting me over after school, give me a makeover and try to have me act like them but it didnt work. Peer pressure has never had an effect on me.

In the end I consider the teachers to be the biggest bullies. Had they left me be who I am I would never have gotten insecure about myself and depressed. I know now I am normal because I know many introverts like me who had the same experience in school. Why is it okay to bully introverted children? I know it still happens.