I started padding at about the same age as the OP, and like many others, my introduction to it was through cartoons--Violet from Willy Wonka, Templeton from Charlotte's Web, that insidious "Watch Out for the Munchies" PSA that aired on Saturday mornings on ABC...stuff like that. Watching those made me aroused and curious about what it was like to be fat. I'd stuff pillows and blankets under my shirt, carefully molding and shaping and smooshing them with my hands until my "belly" looked just right. Then I'd spend what seemed like hours admiring my huge, distended belly's profile in the mirror. Years and years and years later, I would still do it. I even used an air pump with a combination of large, heavy duty balloon over a base of blankets under a huge shirt with snaps on it so I could pop the buttons off one by one as my enormous belly slowly inflated. I loved it when the expanding balloon eventually created huge gaps in the shirt between the buttons just before the snaps exploded apart. That really added to the experience. I really felt "fat" doing that--the tightness of the shirts around my "belly" whenever I padded felt great.