I found the seeds of my purpose in remembering what I wanted or were important to me as a child: solitude,climbing trees, curiosity, people getting along and not fighting (I grew up during the violence of the 60's), reading, and making up poetry and songs and entertaining people. I also saw that I liked helping people, and going for Sunday drives and exploring new places. I was able to come up with a purpose statement that included all these things. Children come into the world naturally moving towards their purpose. So, identifying what came naturally before I was told to sit up straight, don't bother people, we can't afford it, be practical, or was scared out of my wits by "socializing influcences" -- that was the key for me.
Maybe this will help you. Keep us posted.