“I know my place” was the title of a famous sketch on English class sensibilities from the 1960s, starring the very tall (Upper Class) John Cleese, the average height (Middle Class) Ronnie Barker, and the very short (Lower Class) Ronnie Corbett.
The Upper Class Cleese generally looked down on both Middle Class Barker and Lower Class Corbett; Barker looked up to Cleese and down on Corbett; and Corbett “knew his place”. That was at the bottom of the English class system pecking order, and surviving his place meant living life with lowered expectations.