The situation is never at fault. It is the way you choose to view it. Your perspective is how you choose to see the world. There are many things known and many things unknown and so it is easy to be influenced. Because of it, the perception becomes distorted and affects the way you lead your life.
Deep within, each and everyone of us longs for something or someone, that we know we can never have. But there is no pursuit of happiness, no reaching for something. It is just the empty long road where you are the sole traveller. It is just us and life and the way we look at things.
How we look at things is how we look at us. What we see around us is what we see inside us. If there is no happiness in the world, you will never find any happiness in yourself.