Why does she stare at me?

k then im am a average dude 5 10 in the 8th grade i make ppl lol for some reason an this girl i think is beautiful and i don't like her 4 just her looks only we have a lot in common 2 and i have been having a crush on her 4 a year now but i don't have the balls to ask her out cuz she has a bf and lots of friends but. and im kinda of shy and loud as hell kinda guy only at certain times though like around girls im a pussy but does anybody now what i should do cuz i think she crushin' me cuz she looks at me in track and i class and use 2 on the bus to r away games in b ball wat should i tell her hey i like u but im 2 pusy 2 ask u out and your way out my league idk