My opinions on trans people really comes from a place of compassion because I think trans people are mentally ill so they definitely need therapy and support for their delusional thinking. It is a delusion to think you can feel that your sex is wrong or that you're really the opposite sex, as much as it's a delusion to think you're Napoleon or an animal. What happens now is cruel - creating a myth that they can really *be* the opposite sex, that sexual partners will never know, that they can be real biological "mothers" or "fathers", and of course that doesn't happen. Helping them cope with their mental illness is much better than irreversibly mutilating their bodies and still never being a real man or a real woman. People hyper obsess over this stuff and it's just toxic and futile, and the Kind Thing to do is actually be honest and help them accept reality.
Look, like the friend you mentioned, I'm intersex. I was assigned female at birth (the only time those words are valid imo) and have lived my entire life through thar perspective, as a daughter, sister, wife, mother. My body grew a tina in my mum's womb and i grew my own breasts as a teenager. My medical care, education, employment and interaction with the state have all been mediated by my perceived femaleness. When I was sexually harassed, assaulted and grape it was because the men who did it saw me as a woman.
But even so, I can't say I "feel like a woman". I imagine I do because until I was 20 I'd only ever been told I was a girl/woman, and if ever I compare myself to others I don't perceive any connection to men or masculinity. The reality is I have a mixture of sexual characteristics because my chromosomes are XY. I can only say I feel like myself. Isn't that all any of us can say? Why do the rest of us need to play along with an unhealthy, obsessive delusion to the point that leaders of countries and huge organisations like the NHS or BBC start pretending science and biology and the evidence of our own eyes no longer exist?