Any time. I know how hard it is to stop this behavior. I fight the urges too. For me, it gets easier after you get over the "hump." Like quitting smoking, there's a period of time where it's hard as hell not to, but after that, it starts to get easier.
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Another thing that helps me is to see the old scars healing and no new ones forming. I tend to be ashamed of the scars and when I make new ones, I feel even worse. But as they heal, I feel better and better about myself.
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Hope this helps.
Ry