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”。

例句
That comedian was really bad. His jokes were so awful, I didn’t know where to put myself.
那个喜剧演员真的不怎么样。他讲的笑话很没劲，我都不知道是该笑还是哭。

When she rejected his proposal in front of the whole restaurant, he didn’t know where to put himself.
当她在餐厅所有客人面前拒绝了他的求婚后，他尴尬得无地自容。

Was my singing that bad? You don’t look like you know where to put yourself!
我唱得有那么差吗？你看起来特别不自在。