Why Isn’t Elena Blonde In The Vampire Diaries Show?

Seriously, I was just so excited to see they made it into a show. The Vampire Diaries by LJ Smith. And then they show Elena’s character and she has dark hair and eyes!! Elena’s blonde with green eyes. Seriously is it that hard to find a girl with blonde hair or dye her hair??? And Bonnie doesn’t have red hair either. They have to ruin everything.