You are correct. You will explode.
Honestly, I doubt anything will happen. Some people say it makes them very uncomfortable. I did once drink a sugar-free carbonated lemonade. and it didn't bother me at all. Yeah, I know I'm not supposed to drink carbonated drinks, but I didn't realize it was carbonated when I bought it, I was just happy it was zero calories...and it was HOT that day! I drank all sixteen ounces and it went down just like water -- but tasted better!
I have heard some of us have been advised that carbonation will stretch our sleeves, but I was told our sleeves are not that stretchy. I haven't tried carbonation again because I keep feeling like I'd be doing something "wrong" but I didn't have any bad effects the one time I did.