First of all, if your profile is correct, you say that you are between the age of 16-20.
If you are getting down and out and hitting the sauce
NOW, then look out. You have a long and bitter life ahead of you. Getting "shot down" is all part of the game. It will happen again and again. Sure it's a bummer, but at your age, really nothing to lose sleep over.
I had an experiance similar to this when I was in High School. Her name was Jennifer Vasquez. Her and I were like Forrest Gump and Jenny: like peas and carrots. We shared a locker. She'd always leave me silly little notes each day. She'd frequently come over to my house after school. And we always spent at least one of the weekend evenings (Friday or Saturday) hanging out doing something, whether it was to go cruising in Hollywood, or to commit acts of minor vandalism. One Friday night, we went to dinner at Carls Jr. and then got a huge bunch of grapes at the local Alpha Beta and sat there in the car with the radio on just BS
'ing and feeding each other the grapes. It didn't matter. We were always together.
But it was always just that. We were just "friends". Even now, looking back, I think it was odd that here and I NEVER "did" anything. Indeed we hardly ever even hugged. The subject of "us" never really came up. I suspect that had we stayed "together", eventually we would've escalated to that classic "more than just friends".
But her and I got into a fight one day. It wasn't even really a fight. I had a bug up my ass one day, and my stiff necked, stubborn nature got the best of me. I don't remember the details, but I do remember that it involved a debate of going to the lunch line at the cafeteria versus going to the other side of campus for something. She turned around and stormed off. Her and I never spoke again.
Anyway, getting back on topic, all I can tell you is
snap out of it!!!!!!! It's very big of you to want her to be happy, even if not with you. As for those feelings, don't worry about it. If it's meant to be, it'll happen.