Don't bother hacking - first, it's illegal, and second, they'd just make another account.
You should try to talk to your local police, especially if you are under age.
Make sure to take screenshots of the profile as proof, in case they delete it before authorities can look into it!!!
(On a Windows computer there will be a key somewhere that reads "Prt Scr" which will take a photo of your screen and you can paste it into a word document or Paint - I don't know how to take screen shots on a Mac)
I would also try to contact Facebook customer support directly, instead of just clicking report from their profile.