Lydia is very self absorb, she likes to talk about herself and boast her accomplishments. During a visit, she "talked incessantly of lottery tickets, of the fish we had lost and the fish she had won..." (Austen 56).
YES - to all the people who say "it's just a book" or "just a movie" or "just a TV show"... NO IT'S NOT. And what's so wrong about feeling anyway? The opposite of feeling emotion is feeling hardened, and as a human being I would so rather feel too much emotion than none at all.