There is some evidence to support the view that people who act happy are more likely to be happy than those who do not.for example,children may sulk-perhaps in order to gain attention;these children are less happy-even if they succeed in getting attention-than children who do not sulk.Similarly,teenagers coping with the problems of growing up sometimes think that looking depressed may make them seem more interesting. The opposite is true:not only does looking depressed make one less interesting-it also makes one feel depressed!So the best advice is:if you want to be happy,decide to be happy!