"The meaning of life is to find your gift. The purpose of life is to give it away."- Pablo Picasso.
Find your gift, give it to the world through judicious and kind usage and you will find your purpose.
It is funny how the things that makes life purposeful are the little things which many never take time out to find time to do.
Fulfilling purpose if based on our ability to make good use of the things that are within us as gifts, talents, ideas etc.
Living for one's self is a good idea and it sure has its extent and reach, but living for others has a whole more reach that spans 10 lifetimes.
To find your purpose in life, find your gift and hen you find it, use it like it is meant to be used for the world.