What is wrong with being a sadist/masochist?

Seriously, what the hell is wrong with it? I enjoy seeing people, be it man or woman, in fear, or covered in blood while screaming, almost as much as I enjoy harming myself with burns or falling down stairs. You can call me self destructive and all, I'm just going to see you as another puppet to mess with in my fantasy. But aside from that, what is wrong with it? Aside from me hurting myself, I don't harm anyone else(doesn't mean I won't).