FYI: I'm IS.
When I started on ERT, I noticed nothing changed for me, except more breast growth.
My body stayed the same, my moods stayed the same, how I acted and saw the world never changed.
After some time, my scalp did stop being so greasy, and my belly hair did get even softer, and my skin did thin out. But nothing else.
This really bugged me, but since I was still in the closet, and doing it illegally at the time, I couldn't talk to anyone.
When I finally came out, my brother told me about XXY/Klinefelter's syndrome. And at first it seemed to fit. But my t levels where still high on low dose Spiro, which led me to Androgen Insensitivity Syndrome (Partial to be precise.).
Anyway long story short, I've always been hormonally female, so I've always had the "female perspective", but I just really was oblivious.
Like in middle school, I started noticing girls clothing. Or in highschool, when I looked at a female, I always noticed their hair, and wondered if I could wear what they do. I never understood what guys meant by saying a girl was "hot". I was always the person who could turn off the TV to listen to someone.