Self-identity is amazingly strong. I am reminded of a story of a botched circumcision where the doctors counseled the family to raise their boy as a girl. There are documentaries you can look up. Of course throughout his childhood of being called a girl he wanted to be a boy. The story ends with him resuming his born identity and dealing with life as he felt was his path. I realize this story isn't exactly what the topic is today. I have a couple points. First, the treatment for this child was horrifically wrong. He knew who he was and he was tortured mentally being raised as female. He fought until he was satisfied. Second, science was wrong. The thing I love about science is that when it knows better, it does better. Reality may not be what is perceived. Point at genitals and pointing at DNA may or may not be the end of how we are formed and where our identity comes from.