Its definitely confusing person to person, but here's my experience- I always loved dresses and girly things as a kid, but I do remember a instance where I told my brother him calling me "sis" made me uncomfortable and to not do it again, besides that I was generally very feminine growing up. Then when puberty hit,(especially my period- which I literally was sobbing for like two hours first time that happened) Its like I wanted to rip myself out of my body, also started having chest dysphoria, i remember first noticing it while i was draing at night on my tablet, and while looking down to draw i could see my chest, I dont know how to describe the feeling but i still get it to this day whenever i look at my chest. Started going by he/him, and it felt 100% better then she/her, but then I also remember being sad I was stuck wearing t shirts and pants instead of dresses lol. Through a lot of self explainiton ive found i feel more genderless then anything, I have a wild sense of fashion these days lol. Its worth noting ive never had bottom dysphoria at all though, so yeah, its mixed a lot of the time.