Well, it is totally up to you if you choose to show you hand or not. If a player folds, and shows what they folded, you are not under any obligation to show yours.
When a player folds under pressure and show me their folding hand, I sometimes show-but will only show my weakest card, or my non paired card. This puts them on tilt and they start to get more aggressive and make more mistakes.
Sometimes, if I hit a boat or a really good hand, I may show on a rare occasion. If I bluff and push them off I WILL show.
Otherwise, I usually have a rule, especially in big pots;
You want to see my hand, then call my raise.
But if you dont want to show, then you dont have to. And you have nothing to feel guilty about