patterning your developmental schema on the coming-of-age narrative typical of epic fantasy.

I don't think I do that, there was never any doubt in my mind that it was just a story (eg. at several points over the years I've gotten bored of 'me' but not of the universe I've spent hours creating, and started following another character instead. Or introduced long timeskips so I don't have to narrate boring but necessary-to-my-current-plot events).

I'd say that if anything, I absorbed less from all the fantasy and sci fi tropes I read as a kid and teenager than most people. It never occurred to me as a kid that I should be modelling any part of my behaviour after the people in books.