A thought of concern. Will you be accepted into BMQ if you are underweight? I'm only 15 and weigh 105lbs?

My goal is to become a Canadian air force fighter pilot ( I know you don't get to choose once you join and everything; I've read and watched and learnt everything I could from the Internet ) Im starting air cadets this coming September, which will be a great benefit for my future path. In all my classes I'm above 90% and in an AP sciences course path. I find myself a good candidate, but he only problem I see is my weight. I know I'm not done growing but I am naturally skinny and I changed my diet and started working out to gain muscle weight in my arms and toning my abdominal muscles. I looked up pt requirement and I meet them all right now. But then I looked at the weight to height ratio (I'm 5'6 right now at 105lbs) and I estimated my height and saw that I would have to be around 120lbs? If I remember correctly. it is a realistic goal that I could reach in 3years.. So my main question is: do they accept underweight people to go through training? Thanks.