I'm a teenager and I have loose skin? :(

I've been on lots of diets starting from the Age of 13 (up till now - 16), I lost weight(not all, still have 15 more to go)but I just keep on failing and trying again and again. now I've got loose skin, I MEAN REALLY REALLY LOOSE! My arms, MY LEGS! even my tummy! It bothers me, I really need a solution .. Can you help? thank you..
I'm a teenager and I have loose skin? :(
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