March to a different drummer
"They definitely 'march to their own drummer,' so even if they SEEM completely normal, they’ll have some strange quirk that will take you by surprise."
to march to a different drummer / to march to a different tune - to behave in a different way or to believe in different things from the people around you
While most of the country supported military action, Santini was marching to a different drummer. (Cambridge Idioms Dictionary)
"The world was a fantastic, marvelous, awesome place, Rose decided."