A lot of times the feelings you once got from cutting won't be the same. As with any coping method, what once worked will lose it's effectiveness after time.

Cutting used to bring a lot of relief to me, but as you said, it's not the same now. I used to get high off the feeling of cutting and would feel like I was on cloud 9 for 3 days. Now it's not as great as it used to be, but I still use cutting as my main coping method.

I see nothing wrong with it, either.