while body weight is something you can at least control through dedication.
Generally not.
There are quite a lot of disorders affecting eating habits, and there are quite a lot of conditions that mean that even on something like a keto diet you’ll get obese (or extremely thin).
So no, if you are not obese, you most likely are not more “dedicated” than some person you know who is. You are just healthier. Most likely since birth, and there’s nothing they’ve done wrong.