> he fact is that they can never truly be any gender
other than the one they were born as.
If you ever get to be interested in what genders are from a biological perspective, you will realise that there is no such thing as an objectively defined criteria for gender (trust me, sports federations worked hard on that, and failed),... There is also no objective reason to consider that you can't modify your gender, but feel free to argument your case, it will be interesting to dissect it.
And