I went through a similar experience: I've always been a tomboy while growing up and puberty was a shock for me. (Now I can recognize that the disgust I felt for my body was due to moralism, internalized misogyny and the fact that puberty can be challenging to anyone) When I was 14 I told my best friend that I was accepting of trans people and, even if I wasn't trans myself, having breasts was making me feel uncomfortable and I didn't want them. (I also looked for binders online) At that time I didn't know much about the concept of gender identity/disphorya and I thought that the only way to be trans was to undergo all kinds of treatments and surgeries to completely modify the body. I didn't want this for myself but, If I had know about the existence of puberty blockers and if I had been exposed to a certain kind of gender ideology, I am 100% sure that I would have started identifying as "masculine non-binary" or some other shit and I would have wanted to try blockers to stop periods and the developing of my breasts. Needless to say, after a few months I underwent a deep internal change of my beliefs/personality/philosophy of life. I completely stopped feeling repulsed by my body and its functions and I became 100% confident about it. It's a relief to know that other girls went though a similar experience because it makes me feel less alone and I can recognize that we've been very lucky to escape certain consequences. But at the same time it's freaking scary. That's what makes me feel so empathetic towards detransitioners and I'm happy that JK Rowling is talking about it: the detransitioners stories she's been sharing made me literally cry and think "Me too, sister, I've felt the same way too".