I would invest in a juicer (goodwill or garage sale for under $10) Then start juicing away. Lots of veggies and fruits and drink the juice for one meal replacement. Work your way up to be able to do a three day juice fast once a month. It will make you lose a lot of weight fast, it will get rid of a lot of toxins in your body, and it will give you a lot of the vitamins you need as a growing teenager. You could have the juice for breakfast, then eat what you normally do. I would make something like apple carrot pineapple or something like that with a mixture of a few fruits and one vegetable. Cucumbers are great for skin elasticity to avoid getting stretch marks from losing weight.
I would say you could lose approximately 3 pounds or more per week doing that, and that would only take you like 2 and a half months to get to where you would like to be.
Also, don't do any exercises that will bulk you up like lifting weights, but adding a little extra walking to your day will help get off a few pounds quick too.
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most 'emo' or 'scene' girls are bulemic or annorexic or both. trust me, i was one and had that kind of body. it actully isnt attractive in real life because you still have cellulite becaue what little body mass you have is fat, not muscle. it just looks good online beause of alll the photoshop they do. its disgusting.