Well, I did something so so stupid, I sent pictures and a couple of videos to a 21 year old guy from Gambia, I'm 13, I regret it horribly, we just talked our everyday chat at first, then he started asking me and I said no, he said I could trust him and all that kind of thing, so I did it.
After a while I didn't want to anymore but he said I had to and stuff, saying I was his sub, He also sent nude pictures to me.

He has my number, so I texted him and told him that I wasn't doing it anymore, so he said that he is putting all of the pictures and videos on YouTube, I begged him not to, but I refuse to send more pics/videos.
I blocked him on whatsapp and deleted viber (texting for free apps) so he has stopped messaging me, but he still has my number, he texted saying I will have people calling me tonight because with the pictures he is putting my number up,

I am so so scared! I live in england so I don't think the YouTube video will spread over here before its reported and removed, I haven't told ANYONE, but I asked my mum if I could have my number changed and she said yes...
I don't really want to tell her, or anyone.

You shouldn't give your number or send your pics to a person unless you personally know them... try talking to him in a really polite manner.. and if he doesn't accepts it... ttry telling your bigger sis or some friend you can really trust... I hope they can give you better idea of what you should do... may God bless you...

First you have no idea how old he really is, he could be 50. The photos he sent you could easily be of someone else.

You really need to tell your parents what has happened, and they may want to report this to the police who can track this person down.

You do realize that he doesn't have to post those on YouTube for everyone to see them? He could easily post these on thousands of porn sites and they will stay there forever.

I hope you learned your lesson.