We can not avoid this feeling
So it is with intelligence, try to spend your day with lecturers / professors then you will feel idiot, but you try to watch television for 3 hours, and you will feel genius. We can not avoid this feeling, all aspects including success and intelligence are relative, beautiful women will feel threatened with other beautiful women, because that's when they begin to question how beautiful himself (relative factor). Similarly with intelligence, if you feel smart, it will be very painful if there are people who are smarter again and make you feel stupid.