While the George Carlin quote is tongue-in-cheek, and illusory superiority is a bad trait, it is likely that there are areas in which you are better than your peers, and areas where you are lesser than your peers, and it's not impossible (though by no means easy) to measure this in a mostly-objective way. Same goes for illusory inferiority, which is an even worse problem, because it stops you from getting to your potential.
Personally, I try to measure myself objectively by averaging comparables. e.g. Around age 20, I figured out that I cannot blame my horrible shape on my genetics (even though they were at the root of it) - because I knew too many people with similar problems who were in much better shape than I was. So I figured out what the problem really was, and at age 20, after never having been able to complete a run of one mile, built my endurance to 10 miles over 6 months.
As for superiority, you can write down your predictions, and then evaluate them later; you'll see if your feeling of superiority is justified or illusory.
And it REALLY IS helpful to know when you are superior in some respect - or you'll be wasting your time and effort needlessly.
Personally, I try to measure myself objectively by averaging comparables. e.g. Around age 20, I figured out that I cannot blame my horrible shape on my genetics (even though they were at the root of it) - because I knew too many people with similar problems who were in much better shape than I was. So I figured out what the problem really was, and at age 20, after never having been able to complete a run of one mile, built my endurance to 10 miles over 6 months.
As for superiority, you can write down your predictions, and then evaluate them later; you'll see if your feeling of superiority is justified or illusory.
And it REALLY IS helpful to know when you are superior in some respect - or you'll be wasting your time and effort needlessly.