What is wrong with living a life of mundanity?

What is wrong with living a life of mundanity? Why always strive to make a difference, to create, to have a legacy? Why do we believe that we must be more than what we are? Why do we subconsciously strive to live past our own lifespan? Is it possible to accept our average life like an ant in a colony, a bee in a hive? We are just a tiny aspect. So why do we feel shame and guilt when we just live; and experience, void of productivity?