Don't put all your trust in Social Security. While it's a good bet that Social Security will continue to work for the next 20 or so years, some data suggest that if Congress doesn't radically alter the system — either by raising taxes or reducing benefits — Social Security won't be available in its current form. It is probable, however, that Congress will act to "fix" Social Security. In any event, Social Security was never designed to be the only resource for retirees in their later years. That makes it all the more important that you save and invest for the future. 
The folly of youth is believing that there's always enough time for everything. Youngsters often believe that retirement, or wealth building, is something that comes later in life, and are more preoccupied with the concerns of the now. Unfortunately, this often leads to a cycle of "Oh, I should do that next month," month after month, until before you know it, you're 10 years older and you've missed out on a decade's worth of compounding interest. The first step is to stop procrastinating; saving and investing is scary, but the longer you wait to do it, the fewer advantages you have.