I wonder if the most valuable knowledge you can have is the knowledge of what you’re good at. For example, I doubt you are working at the very best job for your aptitude. We tend to drift into our careers. It’s more luck than plan. But imagine if you were born knowing you had the natural aptitude to be the world’s best brain surgeon, or guitar player, or graphic designer. On the flip side, maybe you thought you had more talent in some field than you do, and wasted a lot of time preparing for the wrong profession.
Any assessment of your own abilities is necessarily polluted by your optimism, your pessimism, your passion, and your everyday delusions. On top of that, you are influenced by other people’s opinions of your abilities, and other people are just as clueless as you.
When I was a kid, I wanted to be a famous cartoonist. I assume now that it was more wishful thinking than premonition. But my self-assessment at the time was that I didn’t have the necessary talent. I thought I might someday be a pretty good lawyer, or a banker. So I became an economics major. I got lucky in the sense that I poked around at the wrong professions, trying this and that, including cartooning, until finally something worked. And even as my cartooning career was taking off, the majority of experts were pretty sure I didn’t have the talent to make an impact. All but one syndication company rejected my original submission for Dilbert. And for the first several years, 90% of all newspaper editors didn’t see any potential in it. I was sustained through those years by a handful of insightful people at United Media who thought Dilbert could someday be big.
In summary, the two opinions about your abilities that you should never trust are your own opinions, and the majority’s opinions. But if a handful of people who have a good track record of identifying talent think you have something, you just might.