I Wonder as I Wander

Sometimes I wonder if I'm really doing all I can in life,or if I'm just setting out to fulfil my own selfish goals and neglecting what I should really do in life. Sometimes I wonder if I'm really trying to make a difference in the world in general, or am I just trying to tread water to stay on top of my own life.
I know that I have to survive before I can even hope to help others, but still... Still I wonder if I should be doing more, trying harder, focusing more on the world in general instead of my tiny piece of it. Am I doing what I set out to do? Or am I just living life half-heartedly?
I wish I knew. I really wish I knew.