@strongdomino
Hello Ashley,
As you say genderfluid may be a term that works, but I try not to worry too much about labels, they are there to help simplify describing ourselves, they aren't definitions we have to fit ourselves into!
As to "how to be a girl", there isn't really any advice I can give, because there aren't specific instructions on what that means. You may want to ask yourself what "being a girl" means for you and then work to be that. It's okay to take time and explore who you are. For example gender identity and gender expression are two very different things, and they don't always match up perfectly. Gender identity is your internal sense of yourself and your gender. Whereas gender expression is about what others see; our behaviors, mannerisms, interests and appearance, and is typically more based in gender stereotypes.
As for bra selection, that is often a matter of personal comfort and preference, there are a lot of options to choose from.
I hope you will find what feels right for you!
