OK OK OK so why does what people think and feel about us matter so much.

Why do we strive to make sure our parents like us, our friends like, and even strangers for that matter......The thought of having someone out there mad, upset or dissatisfied with us is terrifying. I want to know why is that? Why can't we just be satisfied with who we are, what we are and what God has made us to be. Even with all our flaws... no one is perfect...we know that in our heads but why does our heart feel that just because we aren't we are flawed.......