表达 “not know where to put oneself（不知道该把自己放在哪里）” 用来形容 “某人非常不自在或尴尬”，有时也表示 “局促不安”。
That comedian was really bad. His jokes were so awful, I didn’t know where to put myself.
When she rejected his proposal in front of the whole restaurant, he didn’t know where to put himself.
Was my singing that bad? You don’t look like you know where to put yourself!