I NEED HELP

I am in love. She does not know, but at the same time I think she does. I wish I knew exactly how she felt, even though I know she would never go with me, she feels we are sisters. What is sad though, is that me and her boyfriend are very close. I think that if you love someone you need to go for it, but i can't. Why the heck can reality be so suckish? I really need help, peeps. This is my first crush. This girl told me that if you have never had a crush, then you can't call yourself a girl until you have had one. Well, sorry to tell you this but , I've finally had a crush and look where it has got me! WHY CAN'T I GET HER OUT OF MY HEAD ?!?!?!?!