Some people seem to be born with a higher baseline of happiness, one large study showed that about 50% of overall life satisfaction comes from genes and another 50% from external events and personal activities. While you may not be able to control what your "basic level" of happiness is, there are things you can do to make your life happier and more fulfilling. Even the happiest of people can feel depressed from time to time, and happiness is something that all people need to consciously pursue. Read God's Word and follow God's guide to happiness.