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Never exercise but I don't gain any weight, what can I do?

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I don't get it I'm 18 and never exercise. I eat breakfast snack dinner snack tea snack everyday and I only weigh 6st 2ibs. I went to my doc and he sed I just had a vv high metabolism but my teachers are poking ther nose in and asking me if I'm eating properly. I say yes and even eat in class when allowed. Most of my mates are quite big size 14 16 18 and a size 20 girl.just a few. I am not even a size 6!!! My clothes come from the kids section of new look or miss selfridge!! I love being thin but my mates are all on diets to get down to my size.