In Holland puberty blockers are now routine and some British parents are taking their kids over to Holland to get blockers
your therapist is living in the past or she worships the ground Ray Blanchard walks on and wants you to grow up and Be a Man or Woman like your Mom and Dad!

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I dunno, seems kind of rude to outright threaten her...
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thats normal reaction cos she is Authority.  You just have to take a deep breath and say what you think.

It sounds like you haven't convinced her enough, but with all this homework you've done it'll help to show that you are serious.
In her eyes you're probably just a young confused person, which just means you have to go that extra mile to prove yourself.
Go in confident and with all the right information to back you up and you'll kick ass!!! You know who you are and you've now done the research to prove it to her!!! GL