You should believe those numbers. I've verified them on my own, and they are right. If you don't believe them, just open up excel and try it out yourself. [If you want to invest, excel is your friend, make nice with it and learn it] Make the 2000 contribution on the first day of the year and grow it at 10% for the year, and then do it again, and again, and again.... In year 26 the investor in column B will have $20,872 while the one in column A who waited will have ZERO. That 7 year jump will mean a huge advantage. It's pretty simple, its just compounding. Yes compounding is that powerful, simple, and it is every investors friend. Albert Einstein supposedly said that compound interest was the greatest wonder of the universe, that's probably apocryphal but the idea is right.
Now the chart assumes 10% growth over the lifetime of the investor. That is optimistic in my opinion, but attainable. But even if you use a lower compounding percentage for both columns, then the investor in column B still wins. Over the last 40 years the S&P 500 (a very broad range of about 500 stocks) has returned 8.3%. Maybe 10% is optimistic, but I'm sure you can at least do that average of 8.3%. Those 40 years include a few recessions including the last one, and the recessions in the 1970s and 1980s. It includes the tech bubble of the 1990s and its crash, the high interest rates of the 70s, the Vietnam war, the OPEC cartel, the cold war. And still 8.3% for the last 40 years.
Thats not to say there is no risk in stocks. There is. So now comes the major conundrum, once you decide to invest where to put it. Deciding to invest is the first skirmish of the war, now you have the rest of the battles to face. You talk about padding yourself from catastrophe. The best way to do that I feel is to hold quality bonds or cash. Another great way to do that is to invest with a "margin of safety." It's a value investor term. At its most basic, it means invest when the price of a stock is close to it's book value. Ie. intel today has a price of $23.46, but a book value of $6.17 (meaning all its plants, buildings, assets, etc... are worth $6.17, so if the company goes bankrupt thats what one of your shares is probably worth). Or you can also dollar cost average your investments. Instead of buying 100 shares now, buy 10 over 10 months to space out the price and to average it.
Right now I feel stocks are overall fully valued at best, and overpriced at worst, I won't put my money into any unless they are value stocks. Oil prices are hurting the market, as is the federal budget and the higher interest rates that will be coming. There appears to be a bubble in real estate as well. But remember that is GOOD for you, it makes stocks fall and it gives you a buying opportunity. I'd love another recession from an investor angle (maybe not because I'd lose my job but thats another story). It's foolish to want the market to do well if you're starting to invest, you want it to tank so you can buy high quality shares at low prices. I like to buy when everyone is crying about how the market is tanking, not when everyone is optimistic. If you want to invest don't flinch at 20% drops! Learn to love them.
As for investing outside the IRA and 401k, I think you should do it, once you max out the 18,000 annual limits of those investment vehicles. OR if you want to invest in something really, really risky then by all means use regular brokerage account so you don't blow your retirement cash.
Do you know where you're going to college? In state or private/out of state? Near home or far? Scholarships or not? Hapy bday and I hope you enjoy college, I know I did.