Ed,
Learn to play _TOURNAMENT_ Bridge, or even Chess. Many of the best traders I know are Bridge players. Some of the biggest names in finance are Bridge players.
Poker or Blackjack may be "more" optimal, however, at your age, IMHO, I do not believe that this is the most important thing to concentrate on. The important thing at your age is to get involved in a fiercely competitive "brain game" environment that requires you to focus for hours.
Apparently, although I have not met any, Marines or other highly disciplined military personel make good traders. The key is their high level of training, their discipline, and their tremendous composure during extreme pressure.
Finally, _NO_ONE_CAN_EVER_TAKE_AWAY_YOUR_EDUCATION_
Believe me, if you are going or preparing to go to University so that you can come out getting a nice job, you will have missed the best time of your life to study the deepest things that some of the most imaginative humans beings have ever created. Go to school to _LEARN_ neat things...
nitro