be out of your element
US /bi aʊt əv jʊər ˈɛl.ɪ.mənt/
UK /bi aʊt əv jʊər ˈɛl.ɪ.mənt/

1.
格格不入, 不适应
to be in a situation that you are not familiar with or comfortable in
:
•
She felt completely out of her element at the formal dinner party.
她在正式晚宴上感到完全格格不入。
•
As a programmer, he was out of his element trying to fix the car engine.
作为一名程序员,他试图修理汽车发动机时感到力不从心。