I know you said that you didn't like the idea of therapy but I sort of hope that you will give it a bit more consideration. Something is causing you to "just do it" and it is very hard to stop if you don't understand what is causing it. You said that your childhood was mess up and probably somewhere in there you will find the cause of your problem and you will only get there with therapy. There are others here who have the same problem and I do hope that one or mire of them can help you too.