fish out of water

fish out of water  {n. phr.}

Человек, находящийся не на своем месте; тот, кто не устраивает, не подходит.

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.

Ср.: OUT OF ONE'S ELEMENT, OUT OF PLACE.