How does Nick feel when Gatsby tells him about things like his time at Oxford his medals for his service in the war and his time living like a young rajah in all the capitals of Europe?

Nick feels impressed by Gatsby's stories and accomplishments, seeing him in a new light as a man of great sophistication and worldly experience. It adds to the air of mystery and allure that surrounds Gatsby, shaping Nick's perception of him as a larger-than-life figure.