Teenage surgery without parent's consent

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[..]
As an adult go right ahead. But not as a child. Not without your parents' consent and a mandatory psychological evaluation ideally.

[Emphasis mine]

https://en.wikipedia.org/wiki/Death_of_Leelah_Alcorn

According to her suicide note, Alcorn had felt "like a girl trapped in a boy's body" since she was four, and came to identify as a transgender girl from the age of fourteen, when she became aware of the term. According to her note, she immediately informed her mother, who reacted "extremely negatively" by claiming that it was only a phase and that God had made her a male, so she could never be a woman. She stated that this made her hate herself, and that she developed a form of depression. Her mother sent her to Christian conversion therapists, but there "only got more Christians telling me that I was selfish and wrong and that I should look to God for help." Aged sixteen, she requested that she be allowed to undergo transition treatment, but was denied permission: "I felt hopeless, that I was just going to look like a man in drag for the rest of my life. On my 16th birthday, when I didn't receive consent from my parents to start transitioning, I cried myself to sleep."

This is what happens when asshole parents don't consent.