Hmm....a girl who takes Physics and Math classes, and is a big gamer. She must be popular amongst the guys then.

I think you could try and find some event like a college game and ask her to join you, to explore more of her interests, and show her what other things you are into as well. Otherwise, she'll probably just see you as another fellow Physics/Maths classmate who happens to share a gaming interest! Find something that will make you a bit different from the others and thus spark her interest in you.