not know where to put (oneself)
To feel particularly awkward, uncomfortable, or embarrassed. My father-in-law's speech was so cringeworthy that I didn't know where to put myself.
not know where to put yourself
feel deeply embarrassed. informal 1986 Robert Sproat Stunning the Punters He was begging and pleading with me…with tears rolling down his cheeks so I didn't know where to put myself.