It's a cop out to think, "I'm not good enough at 'X' or in 'Y'." Titles, recognition, and achievement are seldom contingent on skill or being "good enough," whatever that means anyway.
Have you ever met the allegedly or ostensibly "good enough" people? Or heard them speak?
Just about every "somebody" I've met at big companies is underwhelming. They aren't captivating speakers. They aren't strong writers. The don't have a powerful presence. Their critical thinking skills rank somewhere on the cognitive development chart between plankton and lichen. Most are just products of attrition, occasionally expedited in their rise by route of cronyism or nepotism. They've stuck around long enough, were in the right place at the right time, and/or were connected to the "right people."
And you have to keep that in mind when your mind goes into doubt or self-criticism. Those inept people were able to become presidents, VPs, executives, "somebody" fundamentally by hanging around and connections. Seriously. Learn their stories.
Some of the most captivating speakers I’ve ever heard were lifelong missionaries with barely two nickels to rub together. What they’ve seen and how they’ve devoted themselves to their fellow man is beyond admirable. A doofus who tripped his way to the top can’t capture that impact in a speech. Some of the most rigorous thinkers of all time refused titles. Ever heard of Newton? How many people believe they could outthink Tesla? But he had zero ambition to become the world’s first trillionaire (an easy feat if he would’ve kept the patent on electricity and monetized his inventions). Meanwhile, some goofball who has spent two decades riding other people’s coattails is on a motivational speaking tour.
You don't need to doubt yourself. You are good enough ESPECIALLY when compared to the “movers and shakers” of the world. Just show up; and stick around long enough. It's amazing how "good enough" you are when you just stick around or connect to the right “somebodies.”