Help!

So right now I’m 13 and I’ve been bullied for 3 years now.
In our school desks are made for 2 people and they have sharp edges, so there are these 2 girls who push me intentionally there, and they create these really black bruises that take weeks to heal,if it’s not that then they send some boys to hit me or push me. And if it’s not that they tell people in our class to call me disabled because I don’t like to talk a lot and I pretend I didn’t hear when they ask me for my homework right after they’ve made fun of me. And when those boys they like talk to me it gets worst. I started having mental disorders since I was 10 , and I’m having really bad anxiety for going back to school. I don’t know what to do?