I don't know I can offer much advice on stopping because I struggle with the same issue. But what I can say is that it will get worse if you don't try and stop now. You say you don't cut deep....yeah I used to not cut that deep either. But it got worse. I used to just do a little bit...almost scratches...and it never left scars. Now I have hundreds of scars all over my legs that will never go away. So just be warned...even if you don't think you'll cut deeper....be careful because if you don't stop your need for cutting will get greater and eventually you'll want to cut deeper. I have the samme built up anger towards myself that you describe....that's how it gets worse.