I wasn't always an optimist. I used to think of myself as a realist. But I was always down - I was always looking for the bad in any given situation. And that sucked.
I decided I didn't want to feel that way anymore. So, I stopped. I started forcing myself to look at the brighter side. Someone cut me off in traffic? Maybe they left the water running. Someone was rude to me? They were probably up late with a sick baby last night. Rough day at work? I am thankful that I have a job.
There is always something to be understanding, thankful, and appreciative for. And that has changed my life.