Many of my friends that grew up WASPy also look Fe strong even if it’s
not in their top functions. Nurture plays a big role and it can take
much reflection and consideration to determine one’s true type if their
environment and parental influence was strong. This is especially true
for those who actually have Fe preference and an infj friend of mine
struggles between infj and intj even though he speaks like every infj on
this site.
Hm… I would disagree about the Royal family being an Fe heavy place. Up until Camilla, Kate and Megan Markle if she sticks it out (a possible hat-trick of ESFJs?), I think all their F-type members were Fi (Edward, Fergie, one of the princess-cousins, maybe some of the great-grandkids). It’s a very T-type family. There’s a lot of inferior Fe, though, which I’m not sure is well developed, but they have a lot of etiquette/media training that kind of covers the same bases.
Shadow-functioning and nurture do seem to be very closely tied, though, and as a note, I don’t think there’s a another type that shadow-functions so convincingly in so many directions as ISFPs. I am not surprised you were confused about your preferences, because I am constantly mistaking ISFPs for other types.

