How should my novel start?

Well my story is called romans revenge it's about a girl Roman Darlington she is like a real life barbie and evreyone likes her because she is so mysterious and dosent talk alot. And this boy Drake falls in love with her and wants to know all about her & he finds out that she has a dark secret. And thats why i need help because i dont know what her secret should be & i want her secret 2 be something really unexpected ;)