The average human body has 35 TRILLION cells, and every single one of those cells carries the chromosomes that determine if we are male and female (extremely rare exceptions.) The truth is you can never change your sex.  As someone who respects science I find it disturbing that these activists, and our own government, is trying to make me PRETEND that I believe someone is a sex they are not.  Trans people can feel like a different sex, look like a different sex, and I will be respectful to them etc., but you cannot tell me to play pretend and accept that they have actually become the opposite sex.  The vast vast majority of them have no chromosomal disorders!