Should I Tell My Guy Friened I Like Him? & Maybe Ask Him To Prom? or Should I Not?

Well me and my friend(Tod-not his real name) we've been friends for almost a year now, we've always went to school with each other,bt nvr really started talking till this yr which is our jr yr. & i've grown close to him,i like him, but im not sure if i should tell him or not. HELP??!!