Does she like me? How can I get her to become my girlfriend?

Believe in yourself, (okay so that sounds very parent like) but really....you need to know in your own heart that your worth it, you sound like a smart and insightful guy that cares about people and about your physical health (Track & Field). You just got to believe that your a good catch, whether she says yes to you or if she says no. That's what you need to believe in order to be less nervous and awkward....however notice I said "less" cause the truth is, asking people on dates or making the first move will always be a bit stressful, awkward etc. It just gets a little easier to manage / handle over time - but never completely goes away. :)