Hi there.
We're all happy to help, but we need a little more information on the subject before we can help. How long has this been going on, how old are you, to what extent does this occur...etc. The more we know, the more we can offer.
Additionally, this is a forum, and it takes a bit for replies to come in. We only see your topic when we happen to come to this section. With SO many subsections to the site, it can be awhile.
At first glance, it sounds like masochism (sado-masochism refers to the dual enjoyment of both inflicting and receiving pain), which is sexual pleasure derived from pain. Usually, I'd tell you as long as it's not to a point you are causing yourself severe harm or putting yourself at risk, it's not much to be worried over, provided you're safe about it (like most other things of a sexual nature). However, if it bothers you, we'll need a little more info, if you don't mind.
BTW Doc, on your status, is that the actual lyrics to the song??? That's been a source of debate in my house for years...yet none of us thought to google the thing. -_-