From Longman Dictionary of Contemporary English(be/feel) like a fish out of water(be/feel) like a fish out of waterUNPLEASANTto feel uncomfortable because you feel you do not belong in a place or situation I felt like a fish out of water in my new school. → fish
Examples from the Corpus
(be/feel) like a fish out of water• I felt like a fish out of water.• In his first interview since the move, he still looks like a fish out of water. 