I've Been Having Gas (internal) At First I Thought It

I've been having gas (internal) at first I thought it was all from hunger but then after I eat I would still have them basically .It really embarrasses me when I'm sitting in class .I just want to know like if it's from hunger or what is it from then.? I have class tomorrow and I don't want to be embarrassed sitting in class and having gases (that sound really loud) . In the morning, When I have breakfast like literally 30 minutes ago . My stomach starts growling (or having gas) after like 30 minutes. Like what I do? Is it a gas or growling? Do I have to Burp ? Like what do I drink or eat to get rid of it .