I am 19 years old, female, healthy, normal eating habits, etc, but I do not burp. I've tried drinking soda, swallowing air, etc, and it just makes me feel uncomfortable but doesn't make me burp. Instead, my throat gurgles. The best way to describe the sound is like a stomach growling, only in the throat. It's incredibly embarrassing and I can't prevent it from happening. It tends to happen a lot after I drink juice or soda, but also sometimes after meals where I only drank water.