Why? Not normal? Stop trying to qualify people in a mathmatical sense. That's just insane because you'd have to include all the people alive today and all the dead ones which is impossible.

Hormones effect development. However, most of those changes are physical. Most of the things a girl learns, such as style, make-up, hair etc., etc., etc., is taught to her. A girl is taught what is acceptable female behavior; she is not born knowing what is acceptable.