I think a good part of that is because 'average human' is not a good way to represent who we are individually. I'm probably above average at specific things but in many other respects I'm average or below or wherever I'm supposed to be. Maybe most people are above average even though on average most of us are average.

Fully above average people IMO are like astronauts and stuff. We all live in the shadow of that former navy seal/doctor/astronaut who is like 45 or some crazy shit.