She said I'm only a friend, is there any hope for "us"?

Dude,welcome to the brotherhood! Millions have gone through what your going through, first of all,your very young still,stay focused with your classes and education. 2ndly, if you need to,watch your diet,exercise,small daily workouts every day, cut out sugar products completely. And as far as this girl, I'd leave her be, let her make the move, you did what you thought was a good idea, but,always stay friendly. Time is a good healer, and you may consider asking another girl out, but,you need to take a mind break from her, find someting to do, to occupy your time,stay of the computer,waiting for her, let a few days go by,send her a email, just keep it short,ask her how she's doing, how's her classes, just basic conversation. But, a cold shoulder, is a sign of not rejection, but,maybe she's not looking for a committed relationship, and she might not be offended by what you said, but, not sure how to re-act, so,she's just staying away. Do the same,give her the space, and move on,ask someone else out! Good luck!