Whatever we feel we need externally, we'll always worry on how to get it. Somehow without realizing it, we equate acquiring things with happiness such as a better job, a bigger house, a new car, etc. Haha Well, if you look within yourself and search a little, you realize very little is needed to be happy. Just look at Angel - a creature that moves with its entire being and not conflicted in any way. When it sleeps, it sleeps; When it plays, it plays; When it hunts, it hunts! It's a catmasutra state of mind with the "eyes-wide-shut and ear-to-ear grin", a concoction of childhood innocence cum devil-may-care bravado, with a rich topping of self-belief and unpretentiousness! It's something we all had as children before we subject ourselves to "real-world" programming, and forget our true nature.
If you are not anxious to attain all your temporal desires, then you don't have to worry about the future, and with that you can let go of unnecessary hopes and fears. When you are naturally happy from within (like a catmasutra cat), everything else that you accomplish can be viewed as a special bonus, an extra sweetness to life - and nothing more! Enjoy them for the personal progress and maturity that you gain. They're never a substitute for true happiness!