I am a woman. From birth just to add (since that distinction is obviously important on here).
The problem with that statement, made by a devoted believer in trans ideology, is that the words they use often don't mean what we take them to mean. They take great delight in "queering language" by using words to mean the exact opposite of their true meaning.
We've all watched in dismay as the meaning of some very basic, ordinary words have been "changed", until the dictionary definition of the word woman is considered unspeakably transphobic, and we are supposed to accept that the concept of "woman" now includes "anyone who identifies as a woman". To the point where using the word woman to speak about women's sexual health issues is considered exclusionary, and best replaced by phrases like "bodies with vaginas".
I have personally seen people (who quite obviously have XY chromosomes in every cell in their bodies) claiming that they are "c*s women", genuine females, who were born female.
When pressed for further clarification some will go on to explain, with complete seriousness, that they had the misfortune to be born with a "birth defect", which needed to be treated with hormones and surgeries, but that they have not "changed their sex" (as if that were possible) because they were female all along.