Anecdote: I read an essay a while back by a young man who thought people could choose to be gay or straight, until he volunteered at the Special Olympics. He was supervising a group of men from a group home, and one of them had Down syndrome and functioned at the mental level of a preschooler. The other guys from the group home were checking out women, and the Down syndrome guy was checking out other men. He couldn’t have known the difference between gay and straight; it really was, for him, an instinct.
Now, teenagers who claim to be trans? I really think that a huge percentage of them are indeed saying that for attention, or they think they can get away with assorted misbehaviors if they hide behind the “trans” curtain. This is making things MUCH harder for people who really are trans, or they are intersex.