You aren't alone! I used to hit my arms on things all the time and give myself friction burns. Even now, after not cutting for over 2 years, I still punch myself in the side of the head when I get angry. There is always a point to stopping SI, and there are many reasons to. I can't tell you what yours should be, but I know you can find some. It can be something small to start. I hope you feel better soon.