Straight girl liking another girl?

So there's a girl who goes to my college that I started at in September 12. I never really noticed her until a couple of weeks ago when I saw her looking at me in the college library. I'm not straight. But no one in my college knows that. We tend to sit a few seats away from each other and i've caught her starting at me soooo many times and likewise and when we catch each others eye we just look away lol. I really like her... But i've never actually said a word to her. I'm assuming she's straight? I don't know. Any advice on how to approach this? I'm so confused.

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