Hello and welcome to HCM, This is a very common problem you are experiencing and dont plan on takin drastic steps like leaving the school solely due to this. First of all you need a little lifestyle modification. Eat healthy, avoid junk food, fizzy drinks, avoid over sugary food like chocolates, pastries etc and dairy items. Drink a lot of water. Avoid beans, lentils peas and introduce more insoluble fibre like fruits, vegetables and salads in your diet. And quit smoking. Take anti acidity tablet like omeprazole early in the morning empty stomach. You should be fine. If you continue experiencing trouble,cconsult a physician and rule out intestinal causes. I hope I helped.