People are just afraid of commitment. That's all. Nice guys are usually like that.
With that said, don't go changing yourself to start pleasing other people, because that shit will fall apart in the end. Especially don't be a bitch either, because that'll just be idiotic. Patience is the key to everything.
Be glad that you at least can look around for boyfriends; I've never had a girlfriend and I've got too much crap to do to seriously start looking for one.