Impostor syndrome (also known as impostor phenomenon, impostorism, fraud syndrome or the impostor experience) is a psychological pattern in which an individual doubts their accomplishments or talents and has a persistent internalized fear of being exposed as a "fraud".
At the end of the day, remember this:
You are
here for a reason. In this job, your business, your life, you are
worthy. You are better than you think you are. You are smarter than
you think you are. You know more than you give yourself credit for.
Remember that. And remind yourself as often as you need to.