How do i ask a boy out?

i like this boy and i think he like me 2.but i'm shy when i say shy i really shy like if he will not say hey i will not say hi or if he with his friends i will not look or say anything 2 him and he not asking me well he did but i said i need 2 think but now i have a nickname 4 him and my friends told him i like him and he know it but still didn't ask me,i think i'm in love. i have a song 4 him it call- i call it love- by lionel richie. i still rember when i first saw him i liked him.what should i do