Based on the idiom Bluesman is looking for a place where he feels comfortable and accepted because to fit in means "to belong especially after adjustment".
Answer: Cosmonauts are people trained and certified by the Russian Space Agency to work in space. Astronauts are people trained and certified by NASA, ESA, CSA, or JAXA to work in space.
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Answer:
It means don't conform just if other people are doing it stay true to what you believe.
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That's just my interpretation but it could mean different things. I hope that helps!