like a fish out of wateradvadverb: Describes a verb, adjective, adverb, or clause--for example, "come quickly," "very rare," "happening now," "fall down."
(out of place, out of one's element)
如鱼离水 rú yú lí shuǐ
身陷困境 shēn xiàn kùn jìng
I always feel like a fish out of water at formal gatherings.