God doesn't make mistakes. The devil has lied to man, and man makes the mistakes. Sure this person can be forgiven for what he's done. But God didn't make him a her, he did it on his own!
I want you tell that in front of group of children born with deformities.
IMHO, the saddest thing in this is that treating it like a legitimate "life choice" makes the next poor bugger consider that it is OK to do, and so instead of getting counseling for a "software fix" to overcome their gender identity failure, they go out and get a "hardware fix" to the problem.
If you grow up in a home environment that lacks a real father or mother figure, where a parent has their own rage, or alcohol, or drug, or authoritarian, or low self-esteem problem, you grow up with bad software. This self hatred can manisfest in your own alcohol, food, sex, or drug addictions. I grew up in a home where there was very little emotion, where the rules changed with the situation, where very little supportive was said. The solution was to look to God as my father figure; God sets healthy boundries to keep me safe, loves me more than I love myself, and is wiser than I am. I gave up my "stinkin thinkin" with the aid of counseling, and dumped most of my self-destructive behavior. God loves me; How can I avoid loving myself. Today, I am told by others that I am a wonderful Dad, and I have an emotional closeness with my wife and family that my family of origin never had.
When I found out that my own internal software was flawed, I could have "patched" it with my own wisdom...I did for years, with food, drink and other self-proscribed "self-medication." But I came to a point that I realized that whatever code I could self-generate was flawed. Rather than build a house on sand, I looked to a greater Father...and found out that I was loved beyond what I had ever experienced.
You are who God made you. Along the way, you can get poor software support. The solution is not trying to re-invent yourself in your own wisdom, but to allow God to restore you to be who He made you.