I want to cut myself for my gf
Why would your girlfriend make you want to cut yourself?
Because she doesn't respect me as a person and tells me to do things for her stupid ego
It's very dangerous to cause injury to yourself, and it's not worth the risk since it won't accomplish anything. Your girlfriend should not be asking you to do this, and you should not be willing to remain with someone who is so harmful to you. If this is causing you problems you should seek help.
What do you know?
It is wrong to hurt yourself and you may regret it later. If you are in a bad relationship you should break up and find someone else who will not cause you so much greif.