Ummm.... Not really a question I thought I'd ever want to ask: how did y'all know? Like what let you know that you were a girl?
@spycrab I didn't. I already "crossdressed" plenty, took lots of pictures, got bolder, saw one I recognized a genuine smile in.

And dressed exclusively fem for almost two years before having a breakdown wearing pants on my partner's birthday a day after scheduling an appointment for HRT.

Personal opinion: It's absolutely hardest to figure it out, at least that you're on the wrong hormones, when nonbinary. Even harder when potentially intersex. Maybe impossible of you have alexithymia too.
@spycrab I feel like I just had lucky timing. They were already following WPath v8 a month early, so had me patches the same day. Woke up the next morning and just said 'Oh.'