Ohh, I'm so sorry you feel this upset and angry, it's good that you are SHOWING it and letting it out - that's very important!
If you're being threatened at school you need to tell somebody because that's NOT alright, that's horrible behaviour and that person needs a wake up call, they need to be shown that you can't treat people like that.
Try to tell a parent or a counselor or somebody you feel comfortable with. Nobody has a right to threaten you and make you feel unsafe.