I'm really, really glad to hear that you are taking a deep breath! You have alot of time ahead of you, and life experiences ahead, too. I think what you really might benefit from is really researching all of your options with respect to your future career. Once you know what you want, and what you have to do to get it, the path ahead will be clear. I think it is easy to look ahead and see oneself as fabulous in the career that was chosen, but harder to forsee the work that you have to do to get there.
At the risk of being cliche, it IS true that anything worth getting requires alot of hard work, or else everyone else would be there right now!
If I were to be in your shoes, I would:
1. decide on 2 or 3 career paths
2. research the colleges in Quebec, Ontario, and New Brunswick (at least!)
3. find out the prerequisite courses, and obtain them
4. add a couple of others at the Grade 12 level to make my application competitive
5. with respect to fitness and health careers, research at the YMCA to see if you can volunteer a bit or shadow a fitness professional for a bit to see if you like the job (THIS LOOKS GREAT ON AN APPLICATION, AND ANYONE YOU WORK WITH WILL BE ABLE TO PROVIDE A REFERENCE!)
6. study hard, apply to as many places as possible when the time comes
7. sit back and see what happens.
Sounds pretty uptight, but I think that by failing to plan, you actually plan to fail!!!
Keep us informed!