At the tender age of 17, im not investing in anything personally at the moment.
As a family, each member is putting away small amounts of money (all four of us work), and we are going 1/4's into the property market. This means 1/4 return of any profits made (if any, that is). If we go downhill, we all go downhill.
Once Im 18 and have done what i want to do with my money, save here and there, spend here and there, i plan to invest in the share market and a savings account at the same time. Buy shares that i think will turn out good, as well as investing into an account. But this is all in theory....
Currently in practice im just putting some money away into a 6% p.a account. Once year 12 is over, (few weeks), ill be working full time and putting more away.
I can agree with the whole mates think your boring, gay, lame. I am one of the only one's who saves their hard earned cash into an account paying decent interest, but i am also the one who spends more on his car, is never really broke etc. Ive got more to show for it.