I heard a great quote today:
"I am not who I think I am. I am not who you think I am. I am who I think you think I am." - Charles Cooley
Charles Cooley referred to the "Looking-Glass Self": we come to know ourselves by seeing our reflection in other people’s eyes.
It is hard enough to understand our own perceptions without subjective error. Other people form their perceptions of you through fragments of interactions with you, seen through their own understanding; this introduces subjective error. Our perception of other people's perception (of us) adds another layer of subjective error.
Given that our perception of someone else's perception may drive who you think you are, think hard about who you want to be, who you feel you are, and how you are influenced by yourself and others. Your identity, or more specifically, your perception of your identity, is a critical asset, so make sure you don't sleepwalk into who you think you are. Direct your thinking to what achieves the best outcome.