I think anyone who thinks their body is so wrong that they have to have major and multiple surgeries to "correct" it is suffering from a mental illness. And that's whether it's a woman or man having boob jobs, nose jobs, bum jobs to make them look like Barbie, Ken, a cat etc or a man who wants to be a woman and vice versa.
I actually don't think that most adult males have dysphoria so probably wouldn't be diagnosed with a mental illness in that respect. And I don't think young children can be trans, they are influenced by the adults around them. (I'm talking young children here, not teenagers)
I see it the same as if my child thought they were fat and were starving themselves to get the body thy thought they should have.
By today's definition I would have been a trans child, and the thought that I could have ended up infertile and never being able to have children, and feed children from my breasts that I hated (still don't like!) fills me with horror.
But I'm not trans, I'm an adult human heterosexual female.
I feel there needs to be far more research into why so many children/teens are identifying as trans now. Surely if it were something like better diagnosis, as in autism, we'd be seeing lots of adults my age coming out as transmen, but we're not.
And I think services are so afraid of being seen as anti-trans it's affirmation all the way.
Homosexuality is completely different. Intersex is completely different.