“The greatness of a man is not in how much wealth he acquires, but in his integrity and his ability to affect those around him positively” ~Bob Marley.

That's what I feel is my purpose in life. To leave a positive impact to as many people as I can.

I, however, do not feel there is some sort of predefined purpose. We weren't born for any reason to me. The human race merely exists as a product of the natural process of evolution, just like sand exists as a natural product of erosion, or planets exist as a natural product of gravity. You have to decide which direction you want to take your life in or what purpose it is supposed to have, not somebody else.