Why are we here?

I've been thinking lately. Why are we here on earth? Yeah, to be Christ to people... and to show them what God is really like. But what about non-Christians. What is the human race doing on earth? What is the point? I was talking to Paul about this last night and his answer was astounding to me. He said "we're here for God. We were created by God, for God." That got me thinking about how grieved God must be when we mess up our lives. Imagine... GOD... made us for himself. What an increadible thought! So how then shall we live?
but that brings me to another thought... if God created us for himself, does he want us to live happily on earth? Was he serious about suffering and being persecuted because of him? Are we really suppose to love our life on earth? what about those being killed for their faith? If heaven is our hope, then what's the point of life on earth? I suppose God intended for us to live here on earth in the way he now desires us to live in heaven... perfectly. But we sinned and now we're messed up and it's only by God's grace and the sacrifice of Jesus that we have a hope of being made whole again. So is heaven really our hope? or do we love life here on earth too much? Can you love life too much?
thoughts?