Though it's not the case for all woman, it seems from my experience many like being treated like crap. Maybe it's the effort to get the guy that makes them like it more and more. Being only 18, I think it's also possible it's a maturity thing. While some girls mature, I think most woman realize a sweet devoted man who gives them affection is the way to go.

As of now hooahguy, I have the same problem. I will not say I'm 'needy', but I have no problem devoting more than the good amount of time and energy. I've learned to just cool it. Keep excitement to yourself and treat them normally. Hard for nice guys, but not impossible. Good luck.