It is basically feeling that you are not really a #successful , competent, and smart student, that you are only imposing as such.
Some common feelings and thoughts that might characterize the impostor syndrome are: "I feel like a fake" "My classmates/professors etc. are going to find out I don't really belong here," "Admissions made a mistake," etc.
The impostor syndrome is associated with highly achieving, highly successful people. This makes impostor feelings somewhat different from the concept of "low self-esteem" because there is a discrepancy between the actual #achievement and the person's feelings about the achievement that may not be present in low self-esteem. People in different professions such as teachers, people in the social sciences, people in academia, actresses and actors, may all have impostor feelings.
When Clance and Imes first described the impostor syndrome, they thought it was unique to #women . Since then, a variety of research on the topic has revealed that men, too, can have the unenviable experience of feeling like frauds, according to a recent research review (International Journal of Behavioral Sciences, 2011http://bsris.swu.ac.th/journal/i6/6-6_Jaruwan_73-92.pdf).