I get heartburns randomly, I burp a lot, and sometimes feel nauseous. But no stomach pain or passing out black tarry stools. Is it cancer? I'm scared.

Don't worry! What you're describing sounds like heartburn, also called acid reflux. Keep a diary of food you eat before you have these symptoms. You may have an intolerance to lactose, or gluten. Spicy foods, fruit juices, chocolate, alcohol, and tobacco all contribute to symptoms of heartburn. You could try an over-the-counter antacid to see if that helps. But given your age, cancer is not a concern.