Is there a word for feeling that one is not properly fufilling one's role? [closed]

Does there exist a word for when, for example, one is not being masculine or feminine enough, that one is not American enough? In general, that one is not sufficently meeting expectations of what the group that they are a member of is?

Solution 1:

Perhaps inadequate:

Lacking the quality or quantity required; insufficient for a purpose.

(of a person) unable to deal with a situation or with life.

‘a sad, solitary, inadequate man’

‘I felt like a fraud, inadequate to the task’

Oxford Dictionary

Here is an example of use: The inadequate male in D. H. Lawrence's The Rainbow.