Guys generally prefer sporty girls not necessarily because they play a sport, but because like you said, they don't wear much makeup and don't care too much about appearance. High maintenance is usually associated with drama, hours of primping, shallow, judgmental, and a sense of entitlement. I mean really, what guy WOULD prefer that over the natural, carefree, mellow girl next door?
The key to being an attractive girly girl is to find a happy medium. Wear the cute skirt you love, but don't let it hold you back from doing physical activities like a quick round of soccer or whatever. Do your hair all you want, but don't spend hours on it and or complain if it's less than perfect. Wear your makeup the way you like it, but guys DO find human faces attractive, so don't cake it on.
Don't change who you are just to cater to the majority of guys. If you go all tomboy and manage to get a boyfriend, he wouldn't be falling for the real you. The whole point is to find someone who likes you for you. You have to be completely and totally yourself, as in wearing and doing whatever makes you happy. If you have fun putting on make up and wearing skirts or whatever, then do it. A guy who truly likes you will accept it. Guys would take a girl who's herself over one who pretends to be otherwise any day. (Plus, confidence is a MAJOR turn-on, and you're the most confident when you're in your favorite outfit with your hair and face done how you like it.)