alt Hacker News"born as" (not sure the best way to phrase it)
The usual term is "cisgender", or "cis" for short.
"Cis" and "Trans" both come from Latin; the former means "the same side of" and the latter means "the other side of". If you are happy to be on the same side of the gender binary as what you were assigned when you were born then you are "cisgender"; if you are unhappy with that state of affairs (regardless of how much work you have put into changing it) then you are "transgender".
Adding to this: If you do not want to reference the current gender, you can also use "Assigned Female at Birth" (AFAB), or "Assigned Male at Birth" (AMAB).
This is useful when clarifying terms, when you do not know the persons identity, or when discussing groups based on the factory default settings.