(advice needed ) how do i tell a girl who i like abt my feelings

as the title may tell, i have had this girl who has been my friend for 11 years, I've had feeling for a for a while but dont know how to tell her,im wayy out of her league and don't know how i will approach it, she is constantly getting attention from other guys as they want her, but im always there for her ,helping her comforting her, i have wanted to tell her how i feel but i dont know how,can someone please help