Lexie,
Welcome to the world between the binary. I could say that I am male, and also that I am female. Both are equally true and that means I am both and neither. So both are also equally untrue.
Yes, how much I identify one way or the other changes over time. I am about five years into the process of figuring out who I really am. So far, for me, the process has not stabilized. YMMV...
HTH
Erin