Ugh, I've definitely been that guy with a new bike helmet, feeling like a bobblehead.

That quiet feeling teaches you to try again anyway.

Oh man, that's the worst feeling. I once spent an entire afternoon staring at a loop because I used a single equals sign in the condition instead of a double. What finally worked for me was just walking away for ten minutes and then reading the code out loud, super slow. It sounds silly but hearing it helps spot the little stuff your eyes just skip over.