I'm trying to lose weight but...?

I'm 16 years old and 5'6 too. I started out 133 lbs. In March I started exercising using the Wii Fit (I set a goal to burn 145 calories a day) and doing other exercises. I now weigh 118 lbs. The key is eating 3 healthy meals and ONLY eating when your stomach growls and your body tells you it's hungry. Sometimes when your stomach growl, you're just thirsty too. Try getting a glass of water before eating a full meal. Don't snack or eat junk food or soda. Never skip meals. If you discipline yourself and have a routine of working out and eating healthy, it'd be hard to be a size 5 by August, but set your goal at maybe October and you'll do great. Hope this helps!