The choice ultimately is left to each person. Good or bad, beautiful or miserable, happy or sad, it's your choice. According to Kee, different people have different temperaments. Some are more difficult to care for. But Kee also said it goes beyond the biological components.
Awareness comes through education.
I think it's a learned thing. You must first get educated. Taking classes, reading, getting therapy. Kee said pessimism leads to health problems and downward spirals into depression. He pointed out that optimism is a much more realistic outlook on life.