[header] How to feel fresh and happy, all the time [title] Choose joy. [step] We humans tend to focus on the negative instead of the positive. Our minds give more importance to the negative aspects of most situations. 
If you don't believe it, think about this: a person is complimented six times in a day and criticized once, what does this person think about the most in the following days? Yes, the negative, apparently. Most people are like this: it is a survival mechanism.