I am normal (as far as I know) and sure, I think about things like this but the answer seems more obvious - I look at whatever has my attention at that moment. The flow of attention happens naturally, perhaps that is the difference. I think it's important to remember a couple of things:
People are all focused on themselves more than you.
It's fine to fake it. Social interaction at something like a group meal is a superficial thing, just do what everyone else is doing and ask a couple of questions, answer when someone speaks to you, enjoy the food.