I want to take music in university and I'm not sure exactly how to go about that...

I'm in Grade 10 right now, but I've taken 9, 10 and 11 music (I had an extra elective, to make a long story short).
I'll be taking grade 12 music next year when I'm in grade 11.
I live around Toronto, Ontario.

I've been playing guitar for 3 years (electric bass in my music classes) and I'd say I'm pretty knowledgeable in theory. I've taken very few lessons for guitar.

I'm not sure exactly what I'd like to do with music, but I know I want a 'back-up' other than being a music teacher.

With all that being said, I'm not sure exactly what kind of programs (theory, performance, etc) I should be thinking about or what I should even be thinking about at all when it comes to pursuing a career in music... Any advice is helpful.

If you need any more info, ask away.
Username is from years ago, just saying