Life is a Marathon that you are bound to run in. Whether you like it or not.
After all, neither was your birth by your will nor you had any choice of worlds. Your track is time. Even the pace of your life is predecided. Neither you can complete the race faster and delve into future earlier than others, nor you can remain in current state for a longer duration. It's not the kind of ground track where you stand for a while in the middle of a race to rest.
Irrespective of what you do, your race starts at your's only cry and it ends with the silence of your last breathe. *
The only choice you have is either enjoy it :) or squall over it :(
*The people who didn't cried on their birth may replace the word "cry" with whatever sound they produced.