I was born chubby but I have never grown out of it , how can I loose it?

I am 16, 5ft 4 and around 13 and a half stone. I have always been chubby since birth, I never lost the baby fat. I have large hips, large legs, large upper arms... I don't have a large stomach..
I really want to get rid of the fat in my back!!!
I have tried everything though. Diets don't work as all I lose weight from is my stomach, and I don't need that! I am not lazy either. I walk miles most days. also i have ADHD and i take Equasym which is methylphenidate hydrochloride so i don't know if that affects it
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I was born chubby but I have never grown out of it , how can I loose it?
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