This Mormon Message portrays that everyone is a child of God. We are all God's children, and because of that, we have a purpose in life. The last verse of "I Am a Child of God" says:
I am a child of God, rich blessings are in store.
If I but learn to do His will, I'll live with Him once more.
That is what we are here on earth to do: learn to do His will. I have noticed in my own life that if I try and do things the way I want things to go, it usually doesn't turn out very well, but if I submit my will to what Heavenly Father wants me to do, I am blessed immensely for it.