If you're living in Canada, I'd seperate the toonies and the loonies from the rest of the changes. Having only $5, $10, $20 to spend on would, in my opinion, make me feel like I'm spending a lot. But then, it may be helpful for me to stop spending so much.
Buy things in Canada so you can take advantage of the exchange rates between the American dollar and the Canadian dollar. You'd be able to save money from the exchange value and you'd be helping the Canadian economy too...
Anyways, spending so much isn't an issue. It helps to be busy with schoolwork and not have time to use up with entertainment purposes.
And, may I dare make this suggestion: make your own food from scratch as it'd be cheaper and often tastier than stored bought food items! Plus, you'd be eating much more with homemade cooking and baking.