What do you think plays a bigger important role in behaviour, personality and alpha/beta behaviour?

I'v seen 6'5 225 pounds guys the typical scary looking ''jock/high t men'' act like the nice guy/beta. Which most of them had been bullied at some point.

And then on the other hand, the typical loser looking small dudes that had a tough upbringing be really alpha/ criminals and have low inhibition etc.

What do you really think makes you alpha/social/charismatic/athletic or beta/shy/socially anxious, genetics or environment?