Personally, I experienced this with programming. When I learned to program in high school, it never struck me as a chore; it was always just interesting and I enjoyed it. However, I think the only reason I was able to enjoy learning programming was because of how adept I already was with computers as a "power user", because it gave me the physical skills and conceptual underpinnings required to appreciate the field.…
I have had such a realisation few years back, which I neither was able to put into concrete words, nor did I take it seriously, until I have read yours.
Growing up, I used to love drawing as a child, but later I started to become indifferent towards it and my skill started waning leading me to wonder if I simply disliked it or was just not so good at it. Unbeknownst to me I started practicing in hopes of becoming good enough at it to be able to do better programmer art work for my games. I became reasonably good at it and only then was I able to reason out that my indifference was because programming interested and intrigued me far more than drawing ever had.