You must have a life-long medical condition that requires protection. It is good that you were still able to take advantage of what P&G and Kimberly Clark had to offer at age 16, and avoiding the adult products which were far inferior back then. I was using Pampers, Luvs, and Huggies as part of a pad and pant system, and they worked out very well and were the most discrete by far. Indeed, they made Pampers and Luvs far better back then than they do today.
You probably feel fortunate you out-grew them just before the companies started to severely thin them out, since the current adult-sized ABDL diapers are bound to be thicker and more comfortable. The one throwback on the adult-sized garments, is that they don't have a nice scent, for the most part. But then, even Luvs and Pampers made today are literally void of any perfume, and Huggies have no scent at all. They make baby diapers so wafer thin, they would feel like a regular skivvies, and have about the same absorbency. I never thought much of it, but I guess I feel lucky I'm able to fit the adult medium size.
When I am functioning at my best, and working around an environment that is hostile to someone with my handicap, I still have to go the pad/pant route and deal with a size 6 or 7 cloth-like super-thin super-"breathable" Huggies "insert" so I can maintain a slim, discrete profile and improve my agility. But, they are so thin and feel cold, while still allowing enough freedom for me to map out restrooms and do a 30 second swap when required. I'm just glad that clerks are understanding when they see me ring up a box of Pampers Size 7. Kindness matters!