Does it mean I'm non-binary if I'm happy with my body and would also be happy with it if born male? And at the same time, I have a somewhat masculine self-identity and gender role preference? But honestly, there is something deep down inside my head that tells me that my body is no different from a man's body, it just looks different. It's confusing.
I think that if you feel you don't belong in one, and only one, of the two "checkboxes" then you could be nonbinary. Ultimately, it's your decision how you want to identify, so... Do you want to be nonbinary? Odds are if you really want to be a particular gender, that's probably the gender you should be.