It's best to admit this to yourself and decide to be happy anyway. One of my favorite quotes comes from Alfred D. Souza. But there was always some obstacle in the way, something to be worked through first, some unfinished business, time still to be served, or a debt to be paid. Then life would begin. This perspective has helped me to see that there is no way to happiness.
Happiness is the way.
So, stop waiting until you finish school, until you go back to school, until you lose ten pounds, until you gain ten pounds, until you have kids, until your kids leave the house, until you start work, until you retire, until you get married, until you get divorced, until Friday night, until Sunday morning, until you get a new car or home, until your car or home is paid off, until spring, until summer, until fall, until winter, until you are off welfare, until the first or fifteenth, until your song comes on, until you've had a drink, until you've sobered up, until you die, until you are born again to decide that there is no better time than right now to be happy. Happiness is a journey, not a destination.