Whenever you feel crappy, go find someone and DO SOMETHING SUPER NICE FOR THEM. Yung tipong may ginagawa lang silang something, minding their own business, and then you come up and offer your help or compliment them sincerely or engage in some conversation that you'll both feel more connected to each other. You'll be happy, and they'll most probably be more happy. Everybody wins.

Kindness is the gift that keeps on giving. :>