Why don't girls like nice guys?

I know it is extremely cliche to say this, but the older I get I really believe it to be true. Sometimes I question its legitimacy but then it smacks me in the face not just in my own personal dealings but with people I am close to. Like the green day song nice guys finish last they really do. At heart I am a really nice person, I hate to see others in pain, I enjoy comedies hate horror movies, and like to help someone even when no one else will. But it just seems women aren't interested in these traits all. I'm not sure if they see it as weakness or what. It takes a bigger man to help someone than it does to make fun of someone. "No man stands so tall as when he stoops to help a child" Abraham Lincoln. Also from my perspective I am a decent looking guy 5'9 not too tall pretty muscular I played three sports in highschool and I'm at college so I must not be brain dead. I just can't seem to figure out what girls like, I try to be a really nice guy holding the door and being polite but they take kindness for weakness. Also real quick interjection, do girls have a secret network in which they vote on which guys to like as a group? It seems like if one girl likes you the rest of them do, also the converse statement of this is true as well if one girl doesn't like you then the rest don't. I mean I hate being the asshole guy at parties and being excessively loud, but it works I get girls on my d as soon as I do that. The thing is though that is not who I am and I hate doing it also I can never have a long term relationship because they see the nice guy I really am. I know it is a lot of questions but if I could get some answers especially from women that would be great. Thanks.... Mire a Dios.