I don't know what to do.

I don't know how to kill myself. I want to hang myself but I'm scared about what would happen if i didn't die. Everybody wold ask questions and stuff; the kids at school would make fun of me etc. Even if i threw myself off of a bridge i could still not die. Then I'd be paralyzed, how would i kill myself after that? 
i just don't know what to do.