You're a great size, don't worry about what every other person has and what people think of you. Also low expectations can be a good thing if they are stereotyping you. As a 6'2" white guy, I've actually had people say "Wow your cock is so small, why isn't it 8"?" If you're fooling around with a girl, if by chance that thought crosses her mind when she goes to take off your pants she is going to be treated to a guy with a really hot body and a nice thick cock. So just don't even think anything about stereotypes, you're good like you are.