What should i do about a girl i like?

ok so im 16 and she is 15 and i like her a lot she says she is str8 but she flirts with me she texts me often and IMs me on facebook sometimes we only hung out once though..she acts like she might like me but just doesnt want to admit it or im just going crazy..who knows??..she knows im gay and she said she is cool with it. idk what to do...(please dont answer this question with a your too young to know if your gay or not cuz trust me I AM) :)