For some time my schoolmates have been insulting me and even spitting on me. When I complained to my teachers they said that it is all in my head and that without any evidence they can't do anything. Anyway the situation has got a little bit better but they still make rude comments. I know I should probably let it go but all my life I've been a doormat and I really don't want to allow them to get away with this. What should I do?