On a long flight a little while ago, I saw two couples watch movies while they let their six kids run around like maniacs from take off to touchdown. A seven-year old actually punched me. (I didn't return the punch).
A few days later, I saw the now-typical sight of kids in a decent restaurant eating french fries and chicken fingers while watching a movie on a tablet.
And it's entirely possible you have a boss that lets you do mediocre work, precisely whenever you feel like it.
I wish those kids had said, "Mom, Dad, raise your standards for me. I deserve it."
And the sooner you find a boss who pushes you right to the edge of your ability to be excellent, the better.
Even if the boss is you.