What to do if i cut myself and i don't know why?

See your doctor now: Usually this happens when a person is in an impossible situation, just as animals in the zoo may self-mutilate. If this behavior is discovered, you're likely simply to be considered mentally ill rather than in a situation. Talk with your physician about the big picture of your life, and you may gain insight and/or get help with possible solutions. He/she knows how to help and/or how to refer.