"You come from nothing, you are going back to nothing. What have you lost? Nothing! Cheer up you old bugger."
Those are lines from an old Monty Python song, "Always Look On the Bright Side of Life" which in its essence tells us that we can trudge through life and be annoyed and pity ourselves or we can recognize that life is not something to be taken seriously. Instead we should enjoy life because it is fleeting and one day we will be at the end and contemplating what we did with our lives.