Please help, I don't know what to do..?

It seems like you might be suffering from depression and maybe even a personality disorder. Talking with your parents about getting into therapy would help. Things like this don't go away on their own. Especially if you are self mutilating you should ask for help. I know its hard but it needs done. Sometimes just talking to someone can help. I hope you take my advice. And I hope everything works out for you. Good luck!