I naturally walk quietly, but that doesn't mean I'm a quiet person.
Guess it's because of how I grew up. My mom was a very strange person. Insisted on sleeping on the couch despite having a bed to herself, and decided that it was perfectly normal to sleep at like 4 PM. Even the slightest noise can wake her up, so I just grew up quiet. But after moving out, I'm a lot more social than I was, so I'm pretty loud in other aspects.