We usually wait for the world to change, sometimes the world at large and sometimes our own little world. Since it is not in our hands we don't find it changing according to what we want and we give up trying. We rarely think of changing ourselves, which is possible.
When we change, our thoughts and attitudes change too. We are then able to look at the people and our world around us with a different vision. Thus, we find that our world changes, not so much in the situation as much as in our own perception.