Ugh im obssesing over her so how do i tell her?

okay so i like a girl so much i have her picture that she gave me in my locker and well when i first saw her in third grade ive been madly in love with her (no its not infatuation) i look at her every day but she doesnt notice and plus i cant focus on my schoolwork because of her and im flunking all my cles .Then her friend found out and shes gonna tell her and if she says no ill be heartbroken and flunk even worse.I cant tell my friends because ill be embared and im to scared to write correctly and im the shy type so I cant tell her my feelings and if i wait to long she'll date somone else but i get that stomach sickness when i approach her how do i tell her i love her. Im in the sixth grade and well i haven't told her yet (duh) and then she asked me out but i fainted when she asked and she took it as no and i still regret that because now she might never ask again and i can't ask because i faint easily and am to shy to tell heri mean if i could go back in time and rewrite that.