How do I stop burping?

How do I stop burping (especially in class) of course I'm doing this with my mouth closed but I'm almost positive people can still hear something. I've tried everything. It even happens when I haven't eaten yet ( or drank or chewed gum)I've tried clenching my chest muscles my throat muscles... show more How do I stop burping (especially in class) of course I'm doing this with my mouth closed but I'm almost positive people can still hear something. I've tried everything. It even happens when I haven't eaten yet ( or drank or chewed gum)I've tried clenching my chest muscles my throat muscles everything. It's really really embarrassing and I don't know how to fix it
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