Help with a old crush problem?

Alright, so i have known this girl sense first grade. i have liked her sense then and we are juniors in high school now. in third grade i had to switch schools and i thought i would never see her again. but then in 6-7th grade (myspace age) i found her on myspace and added her, i was soooo excited to talk to her again. so one day i decided i HAD to see her again so i asked her if me and a couple of my friends could meet her at the mall so she agreed. I had decided THAT would have been the day i would confess my feelings for her. so me, a old friend, and my little brother go to meet her, and her sister at the mall. so we meet at the mall and she brings a little brother i had no idea about and her best friend. so i was thinking ok ill just have my friend and little brother distract them long enough for me and her to be alone and i could say what i had to say. well... the first place they wanted to go was victoria secret and my friend decided I dont want to look like a pervert ima ditch them so he ended up ditching all of us and i had to follow him because i was the oldest and i was responsible for him. so me, my brother, and my friend left them and then we went to eat. after we ate i decided i dont care if you come with me or not i am going to express my feeling to this girl. so we went and found them in a store and we walked up to them and they just looked at us in disgust. i then knew i couldn't tell her how i felt because she wouldn't listen.. so we went home and she deleted and blocked me on myspace, and couple years later wont add me facebook. now we moved and we go to the same high school and i think if she wont add me on facebook she wont care to listen to what really happened and how i really felt and feel to this day. i cant just walk up to her and talk to her... i have to find to get her attention and at least tell her how i feel or i will always have that "what-if" feeling my entire life.. so what i am asking you kind helpful people is, what would you do in my situation? i have to tell her what really happened and how i feel. P.S i am a very shy person...