I like this boy and I want to ask him out (read description)?

Well, I fancy a boy about my age at school. I told a boy who then told him, so be is aware of me liking him. My best friend obviously knew because she is, well, my best friend, but she spilled the beans to a snitch who then told him. I really want to ask him out but I am too scared as he might reject me and word will get out. Making me an embarrassed girl.. HELP ME!