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How can I loose weight fast for my cousins wedding?

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I am 14 years old, I am 159 inches tall and I weigh 84 kilos. I am not skinny. How can I loose weight and become slim for my cousins wedding at the beginning of feb? My mum asked me what clothes size I was and I told her I was a 12 because thats what I was last time I went shopping with her. I am actually a 18-20 but my mum has bought my dress and I'm trying it on in the middle of January. How can I become slim. I hate being the fat girl of my school and house.