How to give up?

So I like this girl in my math class, I've known her somewhat for like 3 years, but in class this year I felt like I actually met her. She isn't the most popular of people (me even less so) but she is super nice to me and is just really cool to talk to in general. She actually gives me a reason to look forward to my dull math class. However, I think she just sees me as a cute little sophomore (she's a junior, I'm ahead in math for my grade) and as just a buddy. What should I do to help myself move on?