I mean I am AFAB and I do identify as a girl but also I don’t feel entirely binary. I guess I wasn’t assigned Nonbinary at birth but it still feels weird to say I’m trans when I’m AFAB and present and act like and call myself a girl. I don’t know, help me out here people.
I believe Forrest Valkai said that Biology is moving towards the idea that gender is a spectrum. So your thought seems to mirror that.