Since you wish to bring up our Creator, let’s talk about the science of the body.
When someone creates a thing, it is created for specific use. There is a reason for the creation, a function to fulfill, a role to take. If, for instance, a man creates a machine which is to fill cartons with boxes of candy, and the machine decides to start flinging those boxes across the warehouse floor, no one will say that the machine is operating correctly. An expert will be brought in and the computer that operates the mechanism will be tested and fixed so that the machine works correctly.
Observation of the human body shows us several things about the Creator. Men and women are uniquely structured to fit together. The purpose of this joining, known by observation of how the reproductive organs work, is that life is brought forth. The male sexual organ was not designed to fit into the male rectum. Such activity causes severe damage. Likewise, the union (or perhaps I should say, rubbing together) of the female reproductive parts does not bring them to their proper teleos. It is a sterile and non-productive action which goes against the design of bringing forth life.
In other words, the Creator’s design shows us His intent - that sexual union is for the purpose of bringing forth life. Any other action goes against this design.
Therefore, for a boy to think that he is a girl shows that the computer running his machinery is out of whack and is in desperate need of adjustment so that it works correctly. The purpose of the wonderful computer called the brain is to make the parts of the body function in accord with their design.
In other words, what we have here is a deeply disturbed young man who desperately needs psychological help.