I've always been a loud person — people tell me I'm missing the indoor voice gene — but according to Emily Post [1], booming pipes in public places isn't the most polite thing:

"Keep your voice to a reasonable volume. Public places are noisy by nature, but don't add to the din by talking louder than you must. Think of keeping your voice volume down as a personal form of public service."

This is easier said than done, especially when you're having fun with friends or family at a common place, but tell me, are you conscious of how loud you are when socializing?

Source [2]