Everyone has their “I can do anything” as well as their “I can’t do anything” moments. The problem is that most people aren’t conscious of what’s happening and why. This then holds them back from succeeding.
A few years ago someone even wrote a book on the subject for entrepreneurs. It had a title along the lines of “Entrepreneurial Hypomania.” However, it’s not coming up on Google. You actually don’t need to read the book as it’s a simple concept that you can grasp instantly once someone makes you aware of it.