Sometimes I do feel annoyed when things don't go well while painting. I even deleted some of my paintings lolz and after a while I realise how stupid that was. I could have fixed it later lol. Patience is the key when it comes to art.
In an interview I watched recently, Henry Cavill said the same thing what you said right now. He said and I quote "80% sucess in any job depends on our ability to deal with people" This pretty much narrows down all the jobs especially the ones that deal directly with people like service industry.
I have a small dream, just want to live a life without any regrets :)