The Great Gatsby, what does it all mean?

In the novel the Great Gatsby there are many instances where one can find themselves relating to a certain character or relating someone they know with a character. For me, this anonymous person was found in Gatsby. The naked eye would perceive Gatsby as a well mannered, charming "all american" type of guy. On the inside however he is insecure and afraid and as we find out later, generally not a very good person. He dresses with style and class and isn't afraid to boast his wealth in his purchases. But with a closer look you begin to find the truth about Gatsby. To me it seemed the way he used his little offhand saying "old sport" as a cushion of sorts, making him capable of saying really whatever he feels so long as he lightens the blow with a polite ending. A peek into Gatsby's insecurities happened when Gatsby shows up for his date with Daisy on page 84, an overdressed Gatsby hurries into Nick's house looking pale and tired and immediately asks "Is everything all right?" To me this is the behavior of a man who has a bright and shiny exterior and a dull and weak interior.