People do it for different reasons, I think I do it mostly to try and 'externalise' the pain, make it 'easier' to deal with.. I would say if this is something you just started, try to control it if you can, try not to cut so deep it will scar - you'll regret it later. It goes without saying to stop if you are able, but I know it's hard, obviously... Do you see a therapist, or is there anyone you can talk to about it? Keep posting