I went through similar experiences and my ultimate conclusion was that the problem was those sorts of cultures, not me. There are many, many other employers th

I went through similar experiences and my ultimate conclusion was that the problem was those sorts of cultures, not me. There are many, many other employers than the "Big 4" and a correspondingly large variety of cultures. It is not a sign of strength or brilliance to be able to pass arbitrary (and they are arbitrary) hazing rituals. You are not dumb or worthless for being unable to snap solve BS programming or algorithm puzzles. Find a place, a team and role that is deserving of you. Keep in mind too, that despite the propaganda, none of the "Big 4" does anything really to better the world.