I went through a similar experience at Facebook too. You are not alone in your impostor syndrome and struggles! Thanks for sharing. It was eerily similar to my experiences too. I wrote about my own struggles here: https://medium.com/@Bosefina/confessions-of-a-pm-10-ways-to-disarm-the-impostor-syndrome-6219242a79bb#.rw7vcm60p Glad we’re talking about it :)