Science indisputably dictates that an X and a Y chromosome means you're a male. Putting on a dress and calling yourself "Chelsea" because you believe you were "born into the wrong body" is the quintessential definition of a mental fucking illness.
Top psychiatrists agree with you. Some have complained that they are denied funding for doing more intensive studies on the effects people experience post surgery.
The true 'transgenders' are the small percent who are actually born both sexes. Parents tend to choose one or the other early on, based on whether they think the child appears to be more feminine or masculine or maybe they choose depending on which one they were hoping for. Best to wait for the child to decide but they don't want them to be considered freaks so they think they are helping by putting them through surgery early on.
It has been reported by experts that the people are not happy after a sex change operation because it turns out that it's not the proper solution for their real problems.