We all make 'em.
But the problem - if you're the one who made the mistake - is that its hard to let go. Self-forgiveness is tough to come by.
Ironically, if the mistake somehow impacted somebody else, they'll probably forgive you quicker - if you cop to it right away.
So if you've made any mistakes lately, don't play the excuse card, don't play the blame game. You did it. So admit it.