The reason why we sometimes get annoyed, irritated, aggravated, or pissed off at certain things, or people, is because we've been programmed to react that way. Like cause and effect, we almost force ourselves to say "aw s--t I hate this" automatically in response to certain stimuli. It's not that different from being hypnotized - we react to buzzwords without even thinking about it
If we unscrew the top of our heads and re wire our brains, we can fix this. Don't assume it's going to be unpleasant.
(2). Get perspective.
When we think small, little things can appear life-altering. When we think big, little things are not unimportant, and not meaningless, but they're still little things. Deal with them accordingly.
(3). Make yourself relax.
Work out. Run. Meditate. Anything you can to make yourself chill the hell out. Twisted, worried, and copeless is no way to live. AND IF YOU ARE LIVING THIS WAY, YOU EVENTUALLY WON'T.
You owe it to everyone who comes into contact with you, and you owe it even more to yourself. If you don't relax, life for you will be a sad, sad existence.
Learn some jokes. YouTube some videos. Hang out with really funny people. Lighten up! Life's not perfect, but it's not so terrible either.
(5). The Obvious.
If you haven't already done so, get rid of those who make your life unpleasant and replace them with those who don't. At this point, it should be a no-brainer.