i'd also like to say transitioning as a child is wrong, if my mom said "yes, you can have a sex change" i would have regretted it later on. some people are trans for all of their lives but sometimes people can completely change their mind. it's best to make your decision as an adult and when parents let their child have something done like that it's wrong.
edit: i just don't think young people are rational enough to make life changing decisions. if you get your gender changed at a young age and you have 0 regrets i'm very happy for you. you should really explore your identity first and when you turn 18 i think that's the time to consider if you really want this or not.