Marcus Aurelius: "It is our own power to have no opinion about a thing, and not to be disturbed in our soul; for things themselves have no natural power to form our judgments."
Judy Garland: "Always be a first-rate version of yourself instead of a second-rate version of somebody else."
Q1: Why does it (someone else's behavior, a situation, an event, etc.) matter to you?
Q2: What about you is not good enough to simply be who you are? (As in trying to please or impress others.)
Hmmmm.... outer influences have no power over us other than the power we give them. They have no "natural power" to form our judgments. You've most likely experienced this -- on any given day, a remark, event, person, whatever, makes you crazy, and that same thing on another day doesn't phase you. Oh, yes, it's a choice how you react.
And often, we react in a way that we hope will please others, even if it goes against our basic nature, or violates our sense of self. This doesn't feel good. This is an example of being a "second-rate version of somebody else."
Food for thought, time to watch basketball!