humans try to reach a point where they don't have to change their entire lives. This is what motivates us to do everything we can to survive, trying to reach a state of peace. Evolutionarily speaking, humans and other animals never reach this state of perfection, it is just a goal. But nowadays, what with advances in medicine and other luxuries, people actually reach a state of peace, which makes them fear change even more.
We change so we can survive. We change so we can reach a point of peace and harmony with ourselves.