What another would have done as well as you, do not do it. What another would have said as well as you, do not say it. What another would have written as well, do not write it. Be faithful to that which exists nowhere but in yourself- and thus make yourself indispensable.
It's important to be heroic, ambitious, productive, efficient, creative, and progressive, but these qualities don't necessarily nurture the soul. The soul has different concerns, of equal value: downtime for reflection, conversation, and reverie; beauty that is captivating and pleasuring; relatedness to the environs and to people; and any animal's rhythm of rest and activity.
Accept the pain, cherish the joys, resolve the regrets; then can come the best of benedictions-"If I had my life to live over, I'd do it all the same."