In my English class - 7 years ago - we had Isaac Asimov as topic, but this little story was not one of his.
It was about a single guy on a outpost. He tells about how normal his live is and how nice his lifestyle seems, and the end of story was that he was an alien with more than two arms.
He finds a human and says something like "and this creature has only two arms" or similar.
Can someone help me? I searched this story for my scout in a lesson of "point of view" but haven't found it on the internet so far.