But how does the author differentiate between "insecurity" and "protecting myself from an outcome I do not want." Just because a potential outcome makes me anxious does not inherently mean it's just an "insecurity" that I should "grow out of."
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This is clearly a failure of imagination on the author's part. I'm pretty introverted, and when I was younger I sort of implicitly suspected that no one "really" liked going to concerts. Somehow going to concerts had become a popular thing, and everyone must have been pretending to enjoy them just to fit in.
Clearly, this idea was as incorrect as it was naive. I had suffered a failure of imagination, and had incorrectly assumed that my native perspective was far more common than it is.
I think we've all suffered these sorts of failures at one point or another.