From Longman Dictionary of Contemporary Englishinferiority complexinˌferiˈority ˌcomplex noun [countable usually singular] MPa continuous feeling that you are much less important, clever etc than other people
Examples from the Corpus
inferiority complex• This obviously affects them as they grow up, giving them an inferiority complex.• Atlanta is on a massive ego trip, mixed with a congenital inferiority complex that makes Atlantans overly eager to impress others. 