I also have NO CLUE what one means when they say "I'm a man" or "I'm a woman."
My thoughts and my "being" is just that--"being"--neither male nor female, nothing that simply screams out "I AM A WOMAN!!1!"
My internal voice is 100% gender neutral, it can have emotional inflections but it's certainly not a gentle, lilting voice, nor is it a man's voice.
However, I simply LOATHE my male body, and originally started out wanting to simply "femininze" it a bit...laser, shaving/waxing, stopped weight lifting (well...stopped what little I was doing), etc. The further along I got, the more I wanted--NEEDED--a more complete female body.
But still...I have no idea what it means to have "a female spirit/mind"...I'm just me.