It may sound corny or just too simple, but Norman Vincent Peale said so in The Power of Positive Thinking. Imagine if you could just keep things positive. Simply alter your outlook on things and see if you can remain positive.
Life got you down? Don't stay in the depths of depression. Work on working off the blues. Shake that off.
Live a little more. Love a little bit more. The Blues Brothers may have been full of buffoonery, but they had a good point when they said that everybody needs someone to love.
You can be positive. You have to work at it a bit, but it is worth the work.