Are you an optimist or a pessimist?

At times, I'm not sure which one I'm belong to. I think of myself as being an optimist person most of the times. But at the same time, I do whine a lot or thinking things will fail.

I mean for example, how can an optimist while falling from a 50th storey building says to himself, “ I am still ok, no problem.”

You get the picture?
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