Constantly competing against others to be the best performer is, quite literally, a futile distraction that will hold you back. Aim to be the best you, instead.
There might be truth in the Ali Krieger's approach "there's always room for improvement." The Corporate world is very fond of that phrase. I was always told someone else was doing it better, succeeding better, accomplishing more.
Usually we box things into what we like and don't like. We add opinion and judgment to a situation in order to remember it. Most of the time, we use negative responses to create labels under the mistaken belief that doing so helps us avoid unwanted situations in the future.
Letting go of the worry over whether or not you know enough about a specific element of music will help eliminate the madness that can come from constantly being frustrated and feeling behind the 8 ball.