how do i tell my man i can't get pregnant ?

we been having unprotected sex for 2 years... nothing happens... I know i can't have kids because it's a gut instinct and i know it in my heart... im afraid to go to the doctors to confirm it because if i hear it from them then it's over and i'll be depressed.... My man tells me things like have you had your period already? and i just say yeah i had it but when really it's because he tells me he wants a baby.. It's so devastating..... Should i tell him or ?