Honestly I think imposter syndrome mostly stems from our culture. The vast majority of people emphasize humility at all costs, and being confident or proud of yourself is almost universally seen as a negative trait.
Because of this culture, when you're confident in yourself, people automatically start analyzing you and trying to find flaws and cut you down because, secretly, they feel inadequate themselves and they wish they were as confident as you.
Another effect is that people no longer know how to receive feedback. They won't accept praise because then they feel like they are bragging, but they won't accept criticism either, because then they feel attacked. It is a lose-lose situation for those who cannot break the cycle.
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