Speaking for myself before surgery I ate until I was satisfied which was way more than I needed to fill full. Right after surgery I had ( it's very common) no stomach reaction at all, the nerves were cut and are still healing. So when I felt nothing I wondered if I was doing this right. It's natural to ask 'do I feel like I can eat more?' and natural for your head to say 'yes'. Head hunger, the not satisfied feeling, is always going to be there for you to deal with.
In time you'll regonize your body's other hunger signs (I get cranky and tired) for now stick to the plan assigned. It's not a restriction it's more of a guide to success. It helps those that don't have the stomach reactions gauge if they are on track and those that do make goals to achieve. And stop comparing yourself to 'everyone' you are unique! Use your doctors they can help you on your unique journey.