Gotta be honest I don't think there's a dramatic change unless you make one of it. Some people like to do that, I guess, and make a point of burning all their old clothes and things etc. and starting over. I feel more like every day or every moment I choose can be a new start, and I can take whatever from the past I want with me mentally and ditch the rest. There's a lot I have ditched down the years but not in the sense of trying to disown it. It's just useless junk now. If I think back to my kid self, it's me as I am now only a kid. I remember my mindset back then and it was exactly the same, only more immature. It wasn't as if there was a girl's mindset or a boy's mindset especially - it's just my mindset. The body really should have been male to fit that mindset better, but the fact it wasn't is just something to forget. I didn't pay much attention to it anyway, I just lived in my mind, mostly.
Taking hormones though - that really affirmed for me that I was right all along, which isn't anything to run from. The day I took them I felt like my brain just calmed down and settled into what it always should have been like - chill and relaxed and confident. I already did the uphill struggle to get those years before so I guess it was just an added bonus, but it definitely feels like I was right and that I'm basically being cured now. Cured of the problems that comes from having the disconnect with the body.
The little kid, the young adult, etc. was still me, just me with a disease I'm getting better from.