Therapy is definitely needed, but it isn't easily accessible for everyone.

As a former cutter, I know that you have to find another out. Another escape from reality. You have to find an alternative that can calm you down and relieve stress that doesn't involve harming yourself. Try listening to music, reading a book, watching a movie, playing a game, or just sleeping on it. Tell yourself that every time you feel like cutting or you get depressed, sad, angry, or lonely, that you will do one of these things. If you can stick with it, eventually cutting won't be necessary anymore, you have to get it out of your mind that cutting is even an option to feeling better.