What kind of life are you leading? If you died tomorrow, could you honestly say that you've fulfilled your destiny? Could you say that you were truly a blessing to someone else? Have you lived?
I think Reverend Run put it best: "Dream as if you'll live forever. Live as if you'll die today. You only live once but if you do it right, that's all you need!"
The hand you're dealt isn't your choice, but the life you lead is up to you. Live it.