Well, happy and excited seems to be almost the same thing. While happy and fear - I don't think I ever felt that way in my life.
I wanted to see more about this distinction and found a relevant Wiki page about emotions [1].
"Confusion" appears to be added as a separate emotion in some classifications, while missing from others. When it's added it is added as a neutral emotion (having 0 emotional "tone").
Personally, don't think I experience confusion as an emotion. It's just a mental picture of my state and emotions arise according to how I interpret that picture. Same as "I am lost" or "I am missing a finger" are not emotions, thou they would cause emotions to arise.
