My point? You can't control what life throws at you, but you sure can control how you get through it.
Listen, I'm not saying that you should be Suzy Sunshine from Sunnybrook Farms all the time. Nor am I saying that this is even possible. Sometimes you are just going to have one of those days. Being positive is like taking a shower, you have to do it every day. You have to choose it. You have to purposely say "no" to yourself and change your perspective. Some days it's really easy to do this, and other days it takes a while. Being a seven-year breast cancer survivor, I should know because some days I had to "choose" to be happy. Wasn't easy.
In the end though, being positive and choosing to be happy is a heck of a lot more fun than being stressed out and miserable all the time. I much prefer to laugh than cry.