Perhaps you're right. Who can say? As a gay person, all I know is that for many years I've been on the receiving end of other people telling me that my feelings of same-sex attraction are "intrinsically evil" and "objectively disordered." From that experience I've learned not to accept what other people say my feelings ought to be, because I, and I alone, know what my feelings are. If a transgender person tells me that inside they feel like a person of the opposite sex then I believe them. I don't personally know what that feels like myself, but I trust them to tell the truth about themselves. For me it really is that simple.