BTW, fuck Google! I didn't feel like an imposter while there (2010), but they seemed obsessed with having me do just that! The development tools were garbage and got in the way, the workstation was magically always slow, GWT use further slowed compile/development time, others would cough or make other noises that interrupted, etc.
I don't see why anyone would feel like an imposter around vanilla posturing as though they're something else. Maybe the myth of Google is clouding your judgment (unless you really aren't any good). Anyone poised is either full of it, or more experienced with the environment/tools.
Nootropics tend to increase verbal fluidity and mental clarity. If you decide to do it, take the stack 5 days/week. Start on a weekend to buffer against initial/side effects.