Sex
Sex is the gender of which you where born as, not your pronouns(He/Him,Her/She,Them/They). It is what is inbetween your legs, what you came out as, meaning boy or girl.

Gender is what you go by, like, he/Him, she/her, they/them, etc.
I'm not enjoying the sex I was born as..

That boy's sex is different from his pronounce!

Turns out sex and gender arent directly the same thing!