A person who is out of his proper place in life; someone who does not fit in.
Человек находящийся в непривычном месте; кто-то, кто не чувствует себя комфортно в текущей ситуации.
Because Ed could not swim, he felt like a fish out of water at the beach.
She was the only girl at the party not in a formal dress and she felt like a fish out of water.
The woman was like a fish out of water at the fashion show.
Женщина чувствовала себя не в своей тарелке на модном показе.