I know what you're saying, and maybe I do that here or there. In general, it's not particularly the way I operate. I have, at the back of my mind, any number of things that I'm really thankful for in life (people/things in my life now, people/things I've had at other times, people/things that matter to me). So, all that's in the back of my mind pretty much every minute of every day (although it all kind of sits there silently - but it's there).
Then, too, I've been through enough in my own life to not-think any number of things (like lines at the store) are worth stewing over. Some people mistakenly believe I'm just a "patient person", and that couldn't be farther from the truth. I mean... I'll order something online, and (even though I know better), I'll be looking for the thing to show up the next day. So I'm not the least bit patient, but I have little patience for people who can't/won't control their own impatience and/or who can't/won't try to realize that things like store clerks taking too long a) can just happen, and b) aren't a big deal. One can most often just leave if the wait is too long. And, yes, sometimes some clerk somewhere is young and not particularly seeming as "sharp" as he should; but - really, and again - there's a certain amount of overlooking the unimportant stuff that a mature person does.
I choose my battles really carefully, and I've chosen one it must be important (VERY important) to/for me and/or someone close to me; and THAT'S when I get REAL patient.
When all is said and done, I view me, my days, and my life in terms of "me, my life, the larger world and 'all of life'" (self-centered of me, I suppose). While I'm more than aware of some of the horrors that all kinds of people have lived through/are living through (etc.), it's not really my nature to compare/contrast what goes on with my own life/days with what goes on for other people. If one has his own perspective/approaches one doesn't need to do that. :/ I'm not saying tune out, but looking around at everyone else all the time just adds to head-spinning.