Perhaps your question could be taken seriously if it wasn't so blatantly melodramatic.
For example, what if your child was diagnosed with growth hormone deficiency, would you support their receiving hormone therapy to correct this problem? Or do you believe that they should just accept themselves as God created them?
But the far more interesting question is, should the child have a means of circumventing your wishes and receiving hormone therapy without your consent? After all, it's their entire life that's at stake, not yours, and unless started before the age of thirteen growth hormone therapy is completely ineffective. It could well be argued that in such a case the child should have the option, for their own health and well-being to circumvent the authority of their parents.
When presented in this light the idea of hormone therapy isn't quite so black and white, and it could be argued that when the welfare of the child is dependent upon early intervention, the wishes of the child may indeed take precedence over that of the parents.