I understand where this comes from, but being nice isn't enough. You need to communicate it properly. Girls aren't mind readers. For sure the guy who gets the girls is the guy who approaches and talks with them, and impresses them, not the guy who's educated and nice but doesn't talk.

Girls are passive, and it's unlikely they will approach you. They deal with what they have. If you want to win in this "game", you need to play according to the rules. (The rules are general as human beings aren't predictable, but it goes like this generally speaking).

Also, being too nice isn't necessarily a good thing. Some balance is required. Also, I think how you dress is important. I wear shirts (not very formal, though) all the time, so maybe I appear a little formal or serious. Maybe something casual is more intriguing to girls, I'm not sure. Many things play a role.