To clear a few doubts regarding my future career

Yes you can study Actuarial science from Canada directly after your 12th. There are a number of universities that are offering the program. It is being offered in Undergraduate, Graduate and also at PHD levels.

If you want to join directly after your 12th, then you need to join an undergraduate course. The colleges that you can join are as follows:

1. University of Calgary
2. York University
3. University of Toronto
4. Simon Fraser University
5. University of Manitoba
6. Dalhousie University
7. University of Western Ontario
8. Concordia University
9. University of Regina
10. University of Waterloo
11. St. Jerome's University

Apart from Canada, you have many options in the USA also. My advice to you is that if you are sure you want to do actuarial science, then start planing before you finish your 12th itself. Start researching on these colleges, find out the admissions process and deadlines. Make sure you have all the application papers in place well before the application date. And apply with confidence!

I wish you all the best :)