When did you realize it was all a waste of time and you accomplished nothing?

Do you ever reach an age and think, "what was it all for"? Like you lived envisioning a future. And just when it seems almost in your grasp life comes over like a cosmic bowling ball and smashes the pins and you have to start completely over. If this happened did you ever feel like when life knocked you down you really didn't want to get back up this time? How did you find motivation again.

When did you realize it was all a waste of time and you accomplished nothing?
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