It might come in the category of Obsession/compulsion -- OCD. Just a thought, but it kinda sounds like it -- if it's something that you really feel you can't control.
I'd really suggest seeing a therapist about this. He might be able to help you deal with this compulsion to cut things before it gets too serious. Think about it.
Best of luck and try posting in the OCD forum, ok? Hugs, Lee 
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The truth shall set you free but first it will make you miserable..........................................Garfield
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