Friends Make Fun Of Me :S GIRLS ANSWER!!!?

My friends are making fun of me because I like this Asian girl. I already asked her out but she said "I like you but I have a boyfriend". Im in 6th grade and wants my friends to stop but exell with her (Kayla) at the same time! I don't know what to do. Every time I go home I am really confident in talking to her but when i see her walking in some random direction I instantly PETRIFY!!! I get too nervous to even go in the direction of where she's going..help me please x(