Hello, jms217, and welcome to Psych Central! People can want to hurt themselves for a variety of reasons. We aren't able to diagnose here, but you might want to look at the diagnoses of people who post in this forum to get some idea of what might be going on.
Are you in therapy? A therapist could help you to see what might be going on and to lead you to a more heathy way of dealing with underlying hurt and maybe anger. Many of us find therapy to be helpful.
Please read the suggestions in the sticky at the top of this forum about what to do instead of hurting yourself. Okay?