I try not to have crushes, but this was so unavoidable.

I have this huge crush on a junior girl in my high school..,problem is..I'm a girl and she has the perfect boyfriend anyone can ask for.  Every time I see her my heart beats like there's no tomorrow.  I kind of hate this feeling because I know it's not possible for me and her to date.  I'm this quiet artist freshman while she's this cute talkative junior :/ i don't think she even knows who I am 

i don't know what to do.  I want this feeling to go away