help this guy has put my profile pictures on porn websites and is black mailing me?

[Poppy]

Basically I was on Skype and someone added the guy to the conversation and he was all like you aren't real that's a fake photo. obviously I felt quite complimented by that because he thought I was too hot or whatever, so I link him my facebook and then hes still saying its not me and that hes going to put my pictures on the porn websites unless I go on camera. So I did and he realised it was me, then he started saying if u don't let me wank over you and stay on cam ill put them on. obviously I said no so he did and linked it to me!! he then created a fake profile of me and added my friends and their friends and said hes 'going to hurt me' if my friends report him. what did I do?? people are finding it funny because his name is under something ridiculous ... which is quite a funny name, but still.
I also 16!!!!