I think part of why trans folks end up with this misconception is that there are a bunch of cishet guys who’d happily be a girl for a day. But it’s usually for sexual reasons only (I get to touch boobs!) and they definitely want to change back at the end. Whereas I was always fine with the concept of “being changed into a girl indefinitely” but it was usually as a thing outside my control, so I didn’t have to consider wanting it.