I played female characters growing up

I’m FTM and growing up I always picked female video game characters. Especially the pink ones. In fact I loved pink, so why after growing up why did I grow out of that and somehow hit ‘the tomboy phase’. And now here I am (few years later) identify as a man and picking male characters in games.

I guess what I’m trying to say is how do I know this isn’t just some extended tomboy phase. How can I grow up trans when I was the typical girl for some aspects.

sorry if I’m coming off as rude and/or offensive. this is a genuine worry