Guess what? Being a nice guy is like being a lady. If you feel the need to say you are, then you are not.
http://www.heartless-bitches.com/rants/niceguys/niceguys.shtmlEdit for clarity:
Direct from the blog:
"You don't have to be an ego-inflated, arrogant jerk. You just have to LIKE yourself. You have to know what you want out of life, and go after it. Only then will you be attractive to the kind of woman with whom a long-term relationship is possible."
The point is, there is a big difference between being a nice guy and being a Nice Guy. Nice Guys aren't nice at all. Saying you're nice isn't enough to make you nice.