Your unhappiness doesn't help anyone else - and in fact, as I mentioned in another answer, happy people are more altruistically inclined. So happiness is not a selfish goal.
Gretchen RubinI am living my real life, this is it. Now is now, and if I waited to be happier, waited to have fun, waited to do the things that I know I ought to do, I might never get the chance.
Gretchen Rubin