THERS A GIRL BUT A GUY IN THE WAY?

See there's a girl i like and she goes to my high school and i like her but the problem is i don't think she knows im there even though im in all her cles and here homeroom and there's another guy that was my friend but when i told him i like her he suddenly got all mean and he's now tring to get her and i think he's about to win her and i cant even pluke up the courage to say hi to her even though i can go and start talking to another girl i like but not as much AND SHE HAS A BOY FRIEND so what should i do help me PLZZZZZZZZZZZ