Transgender Science - What Determines Gender?

Carissa was in the male gender at birth. About a decade ago, she transitioned to female. But her new life was sometimes painful. She felt like no matter how many things i try, no one would ever really see me as a woman. To this day, i still have social anxiety around my experience. Eight years ago, i lost hope. But i felt, enough is enough. I'm a scientist. And so from there, i started delving into,. you know, why im i transgender and so forth....