Do you think that transsexualism/transgenderism is a mental illness?
The only people who get to decide are the medical experts, who have spent decades researching and studying. No one else cares about the opinions of the ignorant on this.
No. Some people are born with xxy and yyx and other combinations. Some individuals brains are wired differently at birth that causes the to feel intrinsically they are of one gender even though they are born with the opposite genitalia. People need to understand this is not just a phase people are going through or do on a whim. Science backs this up. People need to educate themselves that our world is not made up of either or things.
XX = female
XY = male
Gender = biological sex for everyone who doesn't have a mental impairment.
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Your explanation is wrong. And luckily for trams people, the entirety of the legitimate medical community disagrees with you.