I'd like to point out that Hermione stopped smiling 1 year before Harry and Ron did. She probably knew the danger long before them <--- I'd like to point out that Harry stopped smiling after year two and Hermoine smiled year three.
Being different isn't a bad thing, it means you're brave enough to be yourself. When I read this quote when I was about nine years old, I decided to live by this quote and be different. Luna has always been my favorite character along with the twins.