This is considered school violence. I think your biggest problem now is to become bolder and explain the situation to the teacher. If you dare not tell the teacher for various reasons, then you must at least learn to make some good friends, because usually you are bullied because you are alone. If you have good friends and usually go together, it will be difficult for others to come over. bully you.
So if you are bullied, you must learn to protect yourself, do not let their behavior become more and more excessive, and make a few friends as soon as possible.