I know enough to know how how little I know. My e-mail signature line. In the initial phases of my life, I honestly intended to learn everything about everything. At a certain point one has to make this realization and be satisfied to know all about those things most important to oneself, while leaving the other things to be known by other people. Otherwise you become engaged in an unending competition with yourself to see how soon you can finish learning everything and eventually this compromises your performance in your specialty area, rather than enhancing it as was the original intention.
Life is fundamentally unfair.
This sounds cold, but you must realize it is true. Just because Bill Gates earns 1000X what you do doesn't make him a 1000X better. Nor are you 1000X better than the homeless person living in the park. Everybody is an individual, with unique capabilities and unique situations to face. You can't get away from yourself.