LGBT: I'm extremely bummed :/?

I've been crushing on this at my school who was interested in me also. andd i'm pretty sure she tried to make something happen, like her and her friend would come over to my locker everyday and stand close to me and just talk, even though they knew no one there and alls i did was ignore it. But now that i think about it she WAS trying to do something. :/ I was just stupid and never paid close attention. Anyways we just kept staring at each other and i was too chicken to smile or say hi. I know for a fact she was waiting for me to do something. Anyways, today was the last day of school and i was looking for her but i never found her until at the end f the day and our eyes met as she was going to leave out the door and before i could smile (like a dirty/cut/i like you smile) she went out the dooring looking at me so yeahh. I completely blew it. :( I added her on facebook though. but i doubt she'll recognize me because she has over a thousand friends so idk what else to do :( and ideas? thanks you guys!