@Rbanks,
Look on the positive side. You could be a student in Japan.
We've seen that acceptable manners differ from country to country. In America what you did would be considered normal, in the UK it gets you detention.
I saw a TV show where they showed a Japanese man who was hired by American companies to train their executives who were being sent to Japan how to get along in Japanesecompany. In Japan, it is considered extremely bad manners to put food into your mouth in front of somebody else. Apparently there are techniques to sort of hide it while you're eating to prevent showing disrespect to others at the table.
If just eating is considered bad manners in Japan, imagine what they do to students who burp.