how do i lose weight when im only twelve?!

you're at a really good weight for your height, and you're not done growing. do not starve yourself, or work out endlessly. 100 pounds IS NOT healthy for your height. if you'd like to gain muscle, cut out the junk food, completely. ask your parents to not buy anymore. take a walk up to 2 miles a day, or around the block two or three times.
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At 5'6, 100 pounds would be underweight. Try not to drop below 120 pounds. It will look healthy on you, trust me. I suggest you drink only water and eat 1200 calories a day, exactly, no more no less. It's simple, easy, and you will lose weight.

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Well I don't know much about diets but whatever you do DO NOT starve yourself, that makes things worse. Your depriving your body of it's essential nutrients. It's way better to eat a lot of healthy foods than not to eat at all.

just start to exercise more and just try to slowly cut down on the bad foods and only drink water. and try not to have snacks also, theyre just extra calories that you dont need.

Ask your doctor for help