Hi I'm 18 please listen I need help

I was on Befriend where I chatted with a girl and exchanged nudes with her over on Imessage, I even showed my face and gave her my WhatsApp number. but then I got scared and deleted everything that was when i received a text message on Whatsapp telling me that they will leak my nudes online along with my face and I'm scared.

I told them that I will give them 500$ I don't even have the money or even a job for that matter they have a business account from Nigeria and I told them that I informed the FBI I was lying but they said they don't care I'm not sure what to do

They tried to call me multiple times

I honestly feel like I have the world to lose and they have everything from my face to my nudes and there is nothing that I can do about it.

The person said that they will let me see them delete it if I pay up but I think it's bs.

Sorry if for the lack of full stops etc I'm scared.