Something I found helped with me is thinking about genders not as something I fit into but something that loosely describes me.
The words themselves are more just to give others a sense of where you stand and they also help bring like minded people together.
But they're descriptions, they don't define you. If you find it comfortable, and find fulfillment in doing things like a "girl" then sure go ahead. But I always think it better not to force that kinda stuff.
Just live how you want to live, live in a way that makes you happy to be you. We're only here for so long so try to enjoy what we have.