He was born male, but lost his genitals due to a medical accident during infancy.
The parents visited all kinds of doctors to resolve the situation, and one doctor offered to take care of the problem.
The problem is that this doctor is a mad scientist, so he says, ‘If this is what happens, let’s raise the child as a girl!’ I come to the conclusion that
Because he was in a position of authority (at the time), his parents believed this claim.
In the end, David Reimer became ‘Brenda Reimer’ and received all kinds of education about herself as a woman and even went through hormone treatment (this ‘education’ was quite a bit of a joke, but let’s get over it for now).
The doctor was led to believe that Reimer’s education had completely transformed her into a woman, but this was not the case.
No matter what kind of external education he received, Reimer had the identity of a man, and as a result, he lived a life of great suffering.
Reimer is able to regain himself as a man again.