I'm presenting as fem as I can and I've been on HRT 7 months, and my own thoughts still misgender me. Not always, but sometimes.
It doesn't actually feel different being a woman, or being on estrogen. I find most people mistake the feeling of being alive with being a specific type of person. I've heard retired family members say they still feel like they're in their 20s, and I feel similarly from transitioning. Being alive feels the same regardless, you will still be yourself no matter what happens.
Even now I still get a bit startled when I see myself in a mirror and instead of saying, "that's me," my brain thinks, "that's a woman."
Your self image may change, but it takes more time than I've spent trying.