You choose on a daily basis whether you are going to be happy. You choose what is going to be the most important thing in your day. Dwell on the best things that happen to you no matter how insignificant to others.
Surround yourself with happy people and things. Your private spaces should have positive and uplifting artwork. Find the sayings and artwork that inspire you. Plant these in your private places such as desk drawer, car,bathroom and wherever you choose. As you travel through your day you will be reminded happiness is a choice.