What do I do to get rid of my muffin top?

I'm asking this here because you are real people with real experiences. I want to know what to do. I am 16 and I have a muffin top. When I suck in my stomach, it measures at 24 but when I don't suck it in, it measures at about 30. What do I do to get rid of it? I'm going to the gym and I see some progress in my legs and arms and posture but not in my stomach. What do I do?
What do I do to get rid of my muffin top?
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