how do i fix this?

I just found out by a few of my previous posts that I'm considered over weight, there's nothing wrong with being overweight or fast or too skinny or anything as long as the owner is happy with their own body, but I'm not so please help. How do I lose some weight? I'm 15,5 foot, im 120lbs, I've tried excersize and i wouldn't be allowed from my parents to use any medication for it. What can I do?
how do i fix this?
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