https://seths.blog/2017/10/imposter-syndrome/. Everyone who is doing important work is working on something that might not work. And it's extremely likely that they're also not the very best qualified person on the planet to be doing that work. You've been getting lucky breaks for a long time. We all have. Isn't doing your best all you can do? Time spent fretting about our status as impostors is time away from dancing with our fear, from leading and from doing work that matters.