I have OSDD-1 (known in Europe as Partial DID). This is important only to explain the presence of alters.
Several months ago, I decided to paint my nails. However, there was an alter in the forefront who didn't like it. He objected to it quite strongly. So every time I looked at my hands, all I could see was that they weren't mine. I tried not to look at them, but it just got worse, until I was ready to cut my hands off at the wrists. Or maybe just cut the wrists. Fortunately, all I had to do was remove the nail polish and I was okay, if a bit disappointed.
Imagine that every time you look in the mirror, the face you see is not yours. And the hair is wrong. And the body is wrong. And the name people call you isn't yours, but you have to answer to it anyway. Even the clothes that fit you perfectly are wrong. And you have to act in ways that aren't you to keep people from realizing that there's something wrong with you.
With all that, why didn't I realize sooner? Believe me, I wish I had. But a large part of surviving childhood for me involved establishing all sorts of masks and shields and losing who I was. When I finally started therapy. I started learning how to unmask, and my true self started to emerge. And when enough masks and shields were removed, I finally realized that I'm transgender. I'm pretty happy with what I am now, and could never go back to what I was before.
I know it's not possible to understand something you haven't experienced. I hope this gives people some degree of understanding.
If you're going to respond, please don't be transphobic or bring up politics. Speaking of which, the following people are politely requested to not participate in this thread: TxTom, Sosoon, JohnR1972, Midnight01, BrianOcean, justwanthugs, wilderdude