Ways for 13 yr old girl to loose 29 pounds by the summer?

I am 13 years old, and I am 5'2-5'3 and i weigh 118.2 lbs. lots of people have told me im not fat, just average-y... I dont need people telling me that, i just dont want to feel uncomfortable with my body this summer when i wear a bathing suit. Tips for ways to loose 20 pounds by June?
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