Question for girls only please about a girl issue?

Hi i am a male aged 15. I love this girl that is only in one of my lessons. She is stunningly beautiful. She loves reading and when I was trying to think of a sweet way to ask her out i wrote her a story. My best friend told her that i liked her and she sent me a message on facebook saying that she really doesn't feel the same way about me and she was really sorry. I dunno what to do? I can't live without her but then the whole of the class know that i like her. It will be sooo embarassing to give it to her when she has friends around so please my question is: how do I get her away from her friends? And what do i say when I give it to her? Thanks in advance! :)