[ianai]

You have a point with being aware of where the “you” ends and things out of “your influence” begin. Accepting that something’s can’t be changed is a good point to reflect that “your” happiness should come from internally - the external is a bonus. Failure to accept this puts others and external factors in control of “your” happiness.

[duttakapil]

Yes. Accepting what you can and cannot control is essential. Worrying about things beyond your influence can be futile. Even within yourself, you might not be able to control your mind or even your life in it's entirety, but you can control what you pay attention to this second. Simply paying attention to the present, mindfulness practice, helps modulate your experience of life without actively trying to control it