I don’t know

I’m in middle school and I know something is wrong with me but I don’t know what. Lately I have been pulling away from my friends and crying myself to sleep a lot. People ask me if I’m ok and I just say I’m tired when I really just want somebody to listen to me. I sometimes get urges to cut myself or wanting to disappear? I guess I just want to know if this is normal or if I need to do something about it