Where does your deepest insecurity come from?

I know this is a really deep question and not everyone will be able to answer but I’m curious if you can.

For me, my deepest insecurity stems from a comment my father made when we were having a talk about his new fitness obsession and how I should join in because “Boys don’t like fat girls.” I was maybe 14 or 15 when we had that talk, I’ve never forgotten that line.
Where does your deepest insecurity come from?
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