It’s a fine question. I was under that impression myself too, for a long time.
I wrote a little bit about my experience over here, and the article I linked earlier captures my thoughts about being male pretty accurately. https://genderdysphoria.fyi/ has a rundown of many different ways gender dysphoria can manifest.
What I felt toward my body was mostly kind of a negligent indifference, like how you might feel about a hotel room on a business trip: it gets the job done and that’s all that matters, and if you don’t treat it with the same care as you would your own house, so what?
I didn’t care how I looked or what anyone thought of me. I’d go days or even weeks without shaving, and several months between haircuts. I picked a facial hair style in high school and kept it forever, because changing it never seemed to make anything better or worse. I did the bare minimum to maintain my health.
I’d wear whatever clothes were on top of the pile. All my shirts were at least one size too big, because I hated the feeling of anything form-fitting on my chest or shoulders: it wasn’t just uncomfortable, it was also inexplicably embarrassing. In fact, my whole wardrobe was like that: baggy stuff that concealed the shape of my body, as if my body was shaped wrong and I didn’t want people to see it.
None of that seemed like a red flag at the time, because I was a nerdy west coast tech guy. I was supposed to be a slob, right? So it was a surprise when it all changed as soon as I started to see myself as more feminine.
Hard to say, especially since those attitudes tend to evolve as someone transitions, and all the trans women I know are already some distance into that process.