I have no idea how to bring this up or how people online do this, so I'm just gonna say it, I'm trans*.
I was assigned female at birth and since I was a young kid I have defied female roles and expectations on purpose; I live with a very conservative family so I had no idea what trans* was or that you could even be trans*. And yet I still consciously behaved and acted in a way that defied things that were, in my 6-year-old self's words, "too girly."
This realization of mine wasn't sudden; it wasn't like a light bulb switching on, it wasn't like something "clicked", although some transfolk feel that way, that is not how it was for me personally. It was more of a gradual realization as I learned more about trans* and what it means.
That being said, I have thought about this in depth and have determined that I am male on the inside. I am still working on coming out to my friends and haven't decided when I'm going to come out to my parents (because I do plan on physically transitioning when I am ready).
As for my name and pronouns, I'd like to go by Casey and use male pronouns from now on.