Becoming a woman is really hard.
If you go through puberty early, your body is ahead of your brain which is still a pre-puberty girl enjoying life and being a girl. Suddenly you're dealing with drastic physical and emotional changes and the expectations and desires of adults around you. Some of whom are practically drooling over you. So you want to stop it.
If you go through puberty at around 14, you've seen your friends go through it and struggle with puberty and you don't want that to happen to you. So you want to stop it.
If you go through puberty later still, you worry there's something wrong with you and again you want to stop it.
The only cure sadly, is to go through puberty and that's hard to comprehend when you're at the beginning. It's also bloody hard years into it when you realise you've got years more.
For boys, it's amazing. Aside from embarrassment at vocal changes, and unexpected erections in public, you're stronger, taller, and you've got sex on the brain and you're encouraged to embrace it. Not just by easy available porn, but by the leeway available, the benefit of the doubt you're given, and the praise you get for exercising your masculinity.
No wonder girls will starve themselves or binge eat to hide they're bodies. No wonder they'll resort to butchering their own bodies. It's a form of avoiding it.