Purpose?

I get these moments where I think that I have not done my purpose in life. You may call it a phase but now a days I have found myself pondering this issue almost everyday. Looking back to all that has happened to me, I am not saying that I am not proud of myself, it is more of what else should I do? What can I do to feel satisfied or fulfilled in life? I have applied to all charity events that I encounter at work and at home with my family. But I still have the feeling of needing to do more, needing to share more of what I could offer. I better fish for ideas now or else this feeling will never end.