People who struggle with imposter syndrome believe that they are undeserving of their achievements and the high esteem in which they are, in fact, generally held. They feel that they aren’t as competent or intelligent as others might think—and that soon enough, people will discover the truth about them. Those with imposter syndrome—which is not an official diagnosis—are often well accomplished; they may hold high office or have numerous academic degrees.| Psychology Today
The Dunning-Kruger effect is a cognitive bias in which people wrongly overestimate their knowledge or ability in a specific area. This tends to occur because a lack of self-awareness prevents them from accurately assessing their own skills.| Psychology Today