I am also among those who have daydreams about a career as a pilot. I still have time (I am 23) to start making the dream come true, but the problem - if you can call it one - is that I am not exactly sure what kind of flying I would like to do.
A year ago I would've hated the idea of flying small turboprops for living, now I tend to think that it might be more fun than staring at the instruments for five hours in a jet. Highly a black and white statement, I know, but on the other hand I really do believe that flying for a small air-taxi company or such could be at least as fun job as an airliner! They both have good and bad sides, I guess it's up to you what you prefer.