I'm 21, in my 4th year of biomedical engineering at SFU. Right now on co-op at vancouver general hospital doing imaging research. A little behind schedule, but I feel I made the right choice scaling down my course load last year, as it allowed me to finally have a life. It does mean pursuing a minor in business would be an impossibility though, if I plan on graduating at a reasonable date.
Always wanted to be an aerospace engineer, since I was 5. Then I grew up and realized how unrealistic some goals are. I like to think I'm still somewhat on track though - at least I'm helping people.
As for dreams and ambitions, it depends on which path I choose to take with my education I suppose. I'll have to make a decision on whether to continue with graduate studies in engineering or get an MBA later on in life. I won't know til I get to my honors thesis. I do know that I want to end up in a career where I'll be happy and kept challenged, and that'll allow me to buy a reasonably decent home in Vancouver. <-- a pretty impossible goal these days, I know.
VP of a fair sized car club, making enough money to have some kicking around, getting in better shape than I've ever been, I'd say I'm pretty happy with where I am right now.
I say life is a game of motivation. There's nothing you can't do if you want it bad enough. I've had to want some things pretty bad to get them though, and personally I think I've got quite a ways to go.