Hi JOODI . . .
from a fellow Canuk. Glad you found us and you will find lots of support and encouragement everywhere you wander around this great big site.
There is a forum called "Twenty-somethings" and I'm sure you would fit right into the group because there are a lot of college students over there. BTW, to really fit in around this mostly US place, I do suggest you start translating your kilo's to pounds (2.2 lbs = 1 kilo) and your cm's to inches (1 inch = 2.5 cm); or most of the people you bump into won't know what you are talking about.
As far as your weight is concerned, perhaps you would be okay thinking of 100 pounds for the first 5 feet plus 5 pounds for every inch over that. So for your height of a little over 5'4", a goal weight of 120 pounds (around 54 to 55 Kilos) would probably work out pretty well for you. After you get there, you can always re-assess where you want to be based on how you feel and look.