It's not that they're inferior. It's that there's a gap between what even stars can do and what complete knowledge and perfect judgment would enable. It's simply impossible for a CEO to know for sure whether it's wisest to be incremental or bold, for a lawyer to be certain s/he's picked the right defense, for a physician to be sure when saying, "You're fine," Even eminent experts, those who appear in the media, according to U.C. Berkeley research, have prediction rates no better than chance!
So after you've done what you can reasonably do to become competent and you've reached that sweet spot where yet more study is likely to only minimally improve your success rate, it's time to give yourself a break, time for acceptance of your fallibility, of humankind's fallibility.
I heard a perhaps apocryphal story that at one of America's leading medical schools, the chief resident welcomes each year's interns by telling them, "Each any every one of you is entitled to one clean kill. A patient will enter the hospital reasonably expecting to leave healthy and you'll kill him. Sure you must learn from your mistakes but you must forgive yourself, because medical errors are part of the cost of a medical education. Your worth as a physician is defined by the net effects of your lifetime as a physician."
Whether or not your workplace decisions are life-and-death, work hard to become competent, learn from your mistakes, and then forgive yourself. We're only human.