Pregnancy/kids / baby phobia

I'm like scared of pregnancy .. and am not really the mommy kind.. I have 4 nephews ..I really love em.. I literally raised 2 of em.. I became an aunt in 9th grade . I just feel I've done the raising em part ( they like to spend time with me ) that I don't wanna do it all over again with my own !! Am not Game about being a mom ! Does that make me a bad person ?