The persistent inability to believe that one’s success is deserved or has been legitimately achieved as a result of one’s own efforts or skills.
People suffering from impostor syndrome may be at increased risk of anxiety.
If you’re troubled by this do me, and yourself, a massive favour and Google ‘Famous people with impostor syndrome’. Or just check this out https://www.linkedin.com/pulse/57-famous-people-reveal-how-overcome-imposter-charles-stevenson/: Read. Think. Who and what do you see? Try to tune into the possible usefulness or benefits of impostor syndrome. What is it for? What is it trying to protect you from?
Now consider the opposite, its uglier relative:
Dunning-Kruger effect, in psychology, a cognitive bias whereby people with limited knowledge or competence in a given intellectual or social domain greatly overestimate their own knowledge or competence in that domain relative to objective criteria or to the performance of their peers or of people in general.
So instead of embarking on a never ending mission to prove something to or about yourself, to be absolutely certain that you are always right, why not just forgive yourself for not knowing everything, and recognise that what you do know still has the potential to help others. There is no need to worry about being exposed as a fraud or impostor if you hold what you think you know lightly. In some way you’re an expert to someone, and people can still benefit from what you know.