As an aside, one should be ashamed of being wrong when there was sufficient time and information to be right, and still admit being wrong. It should lead to better care taken next time.
You should resolve to take better care next time, and evaluate where your mistake was, but I don't see how shame helps anything.
You might find Peter McWilliams's Do It: Let's Get Off Our Buts interesting and useful, at least in spots. Several section headings are:
Fear Is the Energy to Do Your Best in a New Situation Guilt Is the Energy for Personal Change Anger Is the Energy for Change Death - The Ultimate Deadline
This is our monthly thread for collecting these little gems and pearls of wisdom, rationality-related quotes you've seen recently, or had stored in your quotesfile for ages, and which might be handy to link to in one of our discussions.