Remember the negative aspects of it. And, if you regret your scars at all, then you shouldn't want to add more.
Your feeling that way, because you require a coping mechanism, and you clearly don't have one. You need to displace all that twisted energy inside you. Get rid of it. Channel it into a different thing.
First, you must ask yourself why you want to cut. If you find the answer, then find a different way to obtain this thing that you want.