A large part of how we experience life has to do with our focus. It's not really the things that happen to us that determine the quality of our lives, it's the way that we feel about those things that really make the difference. One thing that I think helps to keep our focus on the positive is to take on what many people refer to as the attitude of gratitude. I periodically make a list of the things in my life for which I am grateful, and Lee Brower has a wonderful technique for keeping one's focus on gratitude by attaching meaning to an object that one will encounter many times a day. Here he is in the movie The Secret, talking about the "gratitude rock."
Now, it doesn't have to be a rock or something you put in your pocket, necessarily. Guys tend to make more use of their pockets than women do, so a different object might do. Maybe every time you look at your key chain you remember to think of something for which you are grateful. If you do a great deal of driving in your day, you might put something on your dashboard or console that you will see many times throughout the day.
Even one of those rubber bracelets can serve as a reminder to you to focus on what you have rather than what you haven't.
Try it. See if it helps make your day go a little easier.