I could understand why you would not be aware, even if in fact you may have associated with someone with this physical abnormality, unless you got intimate with everyone you met.
Thinking back to high school I think I knew a girl that was one, but I can't confirm it. Without getting into details I will just say that her boyfriend was a friend of mine and what he told me now makes me believe she was a hermaphrodite. They are born that way and the surgery takes place to remove the confusion, not to make them hermaphrodites.
If you believe it is a myth, I assure you it is not. All you have to do is perform a search and you will see pages upon pages documenting the condition. Some even with pictures.
It is a myth
There has never been a fully functional male and female in the same human body ever documented
There are some with mismatched sexual apparatus
Immature ovarian tissue in a man
Penis looking clitoris and hood
Mammarial conflict
But never a true hermaphrodite that I’ve ever read of documented