The new student felt awkward in the unfamiliar school.
misfit
Frequency:
45
%
He always felt like a misfit in the group of extroverts.
alien
Frequency:
40
%
Living in a new country made her feel like an alien.
Idiomatic Expressions for fish out of water
Phrase: like a fish out of water
Meaning: to be in a situation where one feels uncomfortable or out of place
Usage: He was the only one at the party who didn't know anyone, so he felt like a fish out of water.