When I'm sad and alone, I want to cut myself.
Try doing something physical. If you haven't exercised before, it is a good idea to get your doctor's approval first, but this can be helpful.The more you can find out about when you want to cut, the easier it will be to figure out what else you can do. If you are feeling sad or angry or nervous, look at what is leading up to those feelings and talk to someone about that.You said you are alone. I would see if you can find someone that you can trust to talk with about what you are going through. This could be a parent, a friend, someone at school, a coworker, or any number of other people.