Admit it. At some point in your life or career, you felt unqualified for the role you were in or the role you wanted. You felt like an imposter. It's true for all of us, even those people you look up to because you believe they have something you don't that propelled them to the "perfect" life.
The truth is, if you want a better life or career for yourself or your family, you need to acknowledge that you are unqualified and then move forward anyway.