For me, I sometimes forget the fact I wasn’t born male. My mom told me not to get pregnant and I was confused as to how this would be humanly possible until I remembered I was born female.
When I had longer hair, I looked in the mirror a few times and saw myself as a guy by accident. I once even called myself a good-looking guy until I corrected myself.
On rare occasions, I’d refer to myself as a guy inside my head until I corrected myself. To be clear, I don’t view “guy” as a gender neutral word unless it’s used in the context of talking to a group of people.
I once misheard my mom as if she called me a he and my brain was like “That’s right. I AM a he.”
I used to kinda fantasise about a magic machine turning me into a guy just because I’d be a “willing guinea pig” in my fantasy. I even pictured comparing my original voice to the deeper one I’d have. I used to do it as a random daydream when I was bored, nothing more. It has spilled into… this unintentionally.