This is called Imposter Syndrome. I had the same thing when I first got into a company where I was working with seriously smart and talented people.

- https://www.verywellmind.com/imposter-syndrome-and-social-an...

- https://en.wikipedia.org/wiki/Impostor_syndrome

- https://www.psychologytoday.com/us/basics/imposter-syndrome

Long story short: If you're hitting your goals and getting paid, don't sweat the extracurriculars.