Thank you for taking the time to write this, I got a job at FANG right out of college and the impostor syndrome is real so I have compensated with a lot of extra work. Unfortunately the truth is at this scale my contribution makes little difference and the extra hours even less so. I just end up burning myself out over nothing.
Take this with a grain of salt, but I've found myself happiest working for small companies with people that I like being around. The list of reasons why is quite long (I can elaborate if you like), but the only unfortunate downside is you make a lot less money. You do have a chance of winning big in the acquisition lottery though.