How do I lose body fat?

So yeah I'm in a kinda weird situation from the rest of America

I'm fat... but weigh less? I'm 19, 5'9, and only 157 pounds. But I have man boobs and a gut and jiggly thighs and every thing.

Can someone suggest what I should do? its weird being fat but not weighing a lot. maybe I lost a lot of muscle? idk
How do I lose body fat?
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