Maybe in your own mind but that doesn't say anything about others' minds or characteristics that have little to do with minds.
Another question is whether what one person believes should rule what another believes. An example of this is how a person prefers to pronounce "Stephan" or "Davies". Others will usually accede to that person's preference out of good manners and other reasons because it's his name. People will go along with a trans person for the same reason - it's that person's own business and affects no one else. Even if there is friction just regularly decent people should be able to deal with it. For example, a man cut in line at the drug store and I called him out on it. He turns around and is clearly trans. I apologize and she says, "Yeah, because you don't look and you have preconceived ideas!" Okay.
But it's not clear when there is segregation based on a particular set of characteristics, explicit or implicit. Can a trans female participate in a beauty contest? Female sports were created for bodies not minds. It's irrelevant what you think you are. You could believe you are a horse and should be able to live at the stables, but you'd be wrong.
There are other issues that will become more common. Suppose there were gov programs designed to encourage trans citizens, something like grants to create shows with trans actors and themes. A man who's not trans puts on makeup, wears a dress, and claims to be trans for the money and work. Does anyone else have the right to question this imposter?