Is it normal to scratch the middle of your palm with folded paper?

I've always liked to fold untouched pieces of paper and rub the corners against the middle of my palm, especially along the palm lines. It's not just paper though; anything with a fairly sharp corner I have an incredibly strong desire to rub against the middle of my hand, and I lose concentration on whatever it is I was doing, and suddenly become fixated the feeling. It's not a particularly good habit as well, because I've broke the skin and made myself bleed from it before. It gets hard to resist sometimes, and I can end up in a bit of pain.