I eat my own flesh - weird or normal?

Sometimes i nibble on my arm. I get hungry and just bite off a chunk of skin - i have never met anyone else who does that, but it tastes good, and fills me up. And after i work out it is kind of salty. just perfect. Plus, the freakish, bloody pain is enjoyable. Do i have a problem? I'm just wondering if there is anyone out there just like me.