I wonder this. How similar are we? I think we probably all have the basic set of emotions. It's just that different things trigger them for each of us. Some people are more able to let certain things wash over them than others. Sometimes I wonder if we feel things to varying intensities though. I definitely think some people are more sensitive and hurt more deeply than others. Whether they don't have the capacity for that or, they just protect themselves from it, I don't know.
However, ironically, I think the whole 'feeling different to other people' is fairly common. Especially among members here I imagine. Maybe we are different. Maybe we're all slightly different. Maybe the ones kidding themselves are the ones who believe they are normal and steady.