How can I talk to this girl/ is she giving me the "hint"?

So I've had this huge crush on this girl who sits next to me in one of my college classes. She's like incrediblely cute and seems like a sweet girl. I've liked her for a couple of weeks now since I've noticed her. In every class since I have made attempts to try and talk to her. It's mostly just about the class and stuff like that. I sent her a friend request on Facebook about a week ago, and she never responded to it. Should I take that as she isn't interested? If not, how can I try to talk to her more to gain her interest as well. We really aren't on a personal level, so I think it would be weird to just blunty say that I like you. I've never really had to do this before. To be honest, every girl I've ever been involved with has come to me. I mean I think I'm a decent looking guy. Ugh I don't know I really like her, and she's the first girl since my ex that I've been interested in. I want to do this right and I don't know how the hell to start.
How can I talk to this girl/ is she giving me the "hint"?
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