I'm 19, 5'7 and I weight 155 lbs... it's depressing to say the least. I really want to be around 121 lbs, but I don't know how to do it. Since I started being healthy (about a week ago) I've been eating 1200-1300 calories per day and eating low fat/carb... and tomorrow I'm getting a treadmill. Do you think I'll be able to reach my goal if I do an hours exercise a day and stick to my current diet plan?