Without God, we look for whatever we can live for. In the worst cases, we become addicted to impure worldly pleasures. Then there are those who live for the work they happen to enjoy. Artists live for their arts such as painting and music. In all cases, when their life is over, there'll be nothing left for them to live for. If they had tasted God, they would have found that he's the one to live for, as the joy of knowing God intimately, far above the level of any temporary satisfaction you can find in the world, is the ultimate fulfillment beyond our understanding. When your life is over, you'll still have God to enjoy forever. This is how he has made us, so don't fight it.