Tell your parents that you will tell them your password to see if you are doing anything bad on it. Tell them you won't post ANY pictures of you or any of your relatives on your profile. Don't be friends with people you don't know, because they could be creeps looking for naked child photos. Your parents will lecture you, but if you follow these steps, you'll have a Facebook in no time flat!
I agree with candybar my parents sayd I was too young now all I have to do is raise my grades up don't lie about having a FB because even though u will erase the history u can jus live the guilt that ur parents trust you and your secretly ruining it :(!! Just wait I'm pretty sure one day they'll say yes :D