I myself was depressed when I was as young as you are. The thing is, nice people get badly treated, and that's for reasons unknown. I was bullied, made fun of, but then I went insanely angry and just started hitting those bullies to leave me alone, and it worked, but I don't want you to do that. Use your mature rationality and calmness to stop them.

I remember it driving me crazy as well, but then I just didn't care anymore, even though words hurt more than fists, but I chose to ignore them.