I feel empty and without purpose?

Many times I have felt empty, or felt like my life was pointless. I used to think that this feeling came without warning, but over the years I have observed that each of those moments has had one thing in common: I was focusing solely on myself. MY goals, MY career, MY education... whenever any of these pursuits got out of proportion in my life, I began to suffer this kind of doubt. Now, when I feel at loose ends or pointless, I know it means that I need to focus on helping others more. That is my purpose, and I believe it is actually the purpose of all of us.