Our default state is to pay disproportionate attention to our mistakes and carry them (and all the associate embarrassment and disappointment) with us for long periods of time.
As a result, we end up having a long memory for mistakes and a short memory for the learning that came from it.
This turns out to be to counter productive. We learn best when we have a short memory for mistakes and a long memory for the learning.
Let the embarrassment and disappointment go.
Let the learning stay.