i have facial hair, pubic hair, and pit hair.... but its completely normal for you not to have facial or pit hair.
... you dont have anything to worry about anything, it will come.
it is important to remember that all families have different amounts of hair on their body... and yes... its directly related to genetics:
i would say, if you have these wrries, a sibling probably did too. it would be less awk to ask them, thewn to aks your parents.
and when i say ask.... i mean ask like "when did you start shaving" or something
pm if you have anyother questions.