Be interested in something beyond yourself. Go into the world instead of looking at yourself.
Try not to be so obsessed with happiness. Life is not just about being happy.
If you pursue valuable and meaningful activities, you will attain happiness as a side effect more than as something you are able to pursue directly.
Meaning is often something you discover rather than something you choose. Saying happiness is a choice is a lie because happiness depends on more factors than you can control.