I also found it heartbreaking to read, and very interesting. It confirms something I've had unformed in my head for a while, that for many transing teenage girls, the goal isn't to transition out of one sex into the other, it is to move out of the dreaded 'cishet' into 'trans'.
Trans has become decoupled from -sexual already, now it's being decoupled from -gender. Being trans is the entire aim and identity in of itself. Stating "I am trans" is all of it for young girls like Helena. It's "I am special", "I am different - but in a good way", and also "I am not broken, I am not mentally ill, I am not wrong - I only feel those things because I am trans and the world is unaccepting of trans people like me". As well as "I am not a straight, white, middle class, cis-gender BAD PERSON FROM THE OPPRESSOR CLASS". It is not only "I'm not like all the other girls" it's "I'm not like all the other Oppressors".
I also agree with @HermioneWeasley re. the teenage-girlification of gay men. The gay men I know are just... men. They may be a bit more feminine (obviously some are not) but they aren't girls, they aren't interested in acting like they're 14 years old at a sleepover.