Think hard: When's the last time you took credit -- really took credit -- for a job well done? Without giving props to others, shying away from praise or otherwise shifting the recognition to anyone but yourself?
Give your inner Scrooge the boot and give yourself the gift of honoring yourself by upgrading your model of reality, whether it's a better relationship, better health, better anything that you deserve. That's a gift that truly keeps on giving.
Have you ever thought: They made a mistake and actually confused me with someone else much more qualified? Or had the feeling that even if they meant you, it will only be a matter of time before they realize you are a fraud?