Finding my purpose

Often, I sit around and think of the decisions I've made throughout my life and how they have effected where I am today and how those decisions are the soul reason why I am where I am today.  I chose this!  It's a bit confusing and a bit disheartening at the same time. On one hand I have a beautiful fiance and daughter, that I wouldn't change for the world. I feel as though there are ment to be part of my life, and my life up to now was preparation for my fiance and daughter. Then on the other I have no clue on my life's Mission or purpose,  I don't know how to look or where to begin to find it! I pray about it everyday, but I can't help but think that maybe I'm praying the wrong way or that there's something in my current state of life that I need to learn first. I wish I knew.
I'm currently reading a book called, "the purpose driven life," because i heardnwonderful things about it and it also was sugested to me as a way to find the answers I'm looking for. Todays chapter was centered around how you see your life and how you see your life can say alot about you, and then it went on to say how the bible says that life is a test. It reminded me of my childhood, we didn't have awhole lot, in fact we were poor. But my mother made the most of it. My step father became a crack head and it made it worse, being that the little we did have, he would sale to by crack. But during those times, I use to tell my self that god was using this life to test me, and to prepare me for my future,  God was making it hard for me now, so that in the future I would be able to appreciate what was in store for me. I think I lost that, I think I need to rediscover that mentality.