Help getting a manly lesbian girlfriend?

Okay, so theres this girl. I met her the first day of marching band and ive been in love with her since. The problem is that shes a junior, and im a freshman. And she has a girlfriend. I really dont like her girlfriend because shes cheated on her with guys two times before. But thats besides the point. The point is that shes the first girl ive ever liked this much and i want her to notice me, but i dont know how. Im sure she knows i like her, im kinda obvious about it. And yeah.... HELP MEEEE?!?!