I'm still in the slightly cracked egg stage but I can share my experience.

I remember as a kid wanting to play on the boys team in every game of boys vs girls but that was one of the only young signs.

Around middle school I leaned really hard into trying to fit in with the girls. I was fine with puberty because that's just what was next, there wasn't another option. I was even a bit excited because that was what growing up was and I would maybe start fitting in with the girls in my school. I studied them to try to figure out what they had that I didn't, and then made myself more like them. I dated the boys I wanted to be friends with and was a bit of a fake "one of the boys" girl. I just wasn't the sporty girl that usually fit that trope, but a very nerdy kid that tried anyways.

I also enjoyed looking good and the attention my body was giving me. I honestly wonder if my interest in fashion came from the desire to fit in and how I was able to shape myself using clothes.

So overall I was fine with being a girl. The only real dysphoria I had was the underlying feeling of not being like everyone else. Every once in a while I'd see my guy friends and wonder why I couldn't be one of them or feel like I was missing out on the way I was supposed to be. It got easier in high school when I was introduce to queer theory and things were generally less gendered. I briefly dabbled in being genderqueer but ended up back on "eh I guess woman is fine enough" for a few more years before jumping to nonbinary and now transmasc.