One of the things I don't like about yours truely is that I get annoyed at myself when I make the tiniest of mistakes. sigh.
OK, completely different topic, but here I go:
There are a few, only a few important things in life. Then there's a big bunch of stuff that's not important. Most things are in the unimportant category. There's some things that heaps of people tend to think of important that aren't. The trick is to find out / know what, for you, what parts of life are in each category.
For me: Important = family, friends, & having deep, rich experiences maybe.?? (probably better said as "enjoying life")...