I think that we just don't believe you. Did you arrive at every job with perfect knowledge in the areas you'd be working on? Have you not had to learn anything on the job?
If that's the case, then you're vastly overqualified. I feel like I'm being utilized as an employee the best when my manager says: "Hey, there's something weird happening in area X" or "I want you to explore feature X" and I get to dive deep into something for a few days. Our strengths are our ability to learn.