I thought this was interesting. Short article about the memoir of Michael Dillon, born Laura Maud Dillon.
www.irishtimes.com/life-and-style/abroad/ireland-s-remarkable-trans-pioneer-people-thought-i-was-a-woman-but-i-was-just-me-1.4577866
Dillon's Wikipedia page is interesting in that it mentions the editor of Debrett's listed Dillon as next in line for a baronetcy, which I think current law still does not allow for?
en.wikipedia.org/wiki/Michael_Dillon
From the Irish Times article there's an insight into how gender dysphoric people may come to the conclusion that they should have been born the opposite sex:
Aware of his gender-nonconformity from a young age, Dillon crossed a threshold while walking with an acquaintance shortly before he left for Oxford, to study at St Anne’s College, which at the time was for women only. Dillon’s companion on the walk, the nephew of a local vicar, held a gate open for Dillon in a mannerly gesture. Dillon was immediately struck by a thought: He thinks I’m a woman. The moment underlined for Dillon the discordance between who he knew himself to be and how others perceived him. “People thought I was a woman,” he recalled, “but I wasn’t. I was just me.”
It's interesting that the last line is 'I was just me', not 'I was a man' - to me that sounds like Dillon had the belief that women were those people over there, who felt comfortable being treated a certain way, whereas Dillon was an individual, a self. Dillon's book on gender was called 'Self'.