My girlfriend doesnt like me anymore! i want cut myself!!!

Well, you don't have to kill yourself dude. You can make another one, there are plenty of girls out there. And also fighting is normal in a certain relationship, that's why it is called relationship, making out of something, making the relationship works, there are always problems and certain misunderstanding. You should check first the problem why she doesn't care for you, then talk with her, and make something like give her a flowers or an actions that make brighten her day. If doesn't work, then it is a really serious matters, you have to confront here a make calm the situation, and also let here talk, finish what she trying to say, don't make an argument, don't contradict the flow of her actions and words. After she finished her words, then now you know why she acted that way to you, then make a resolution to that. be poetic and at the same time let her feel the romance. :)