Please i need someones help :( PLEASE?

[john]

Im just so scared right now i need help. I was on chatroullete and met someone who i thought was a girl and they wanted to skype so we did. It was this naked chick and so i also revealed myself. They said to show face and my penis and i did i know its so stupid! They said that they took a snapshot and sent it to me, it showed my face and PART of it.
( specifically the tip) (sorry for being disturbing) and they said they were gonna upload it to every social media. Bit the thing is i have no social media whatsoever. No FB,instagram, NOTHING. And they wanted me to pay and i refused, i blocked them and deleted skype and changed skype info but im just soo scared what if they upload it?! What if ppl see it and it gets back to me? Im just soo scared and i need any sort of help? Btw im 16, please i just need something to help me i know i was stupid but i cant stop thinking about this and cant sleep