What do I do if someone is threatening to post me on pornhub ?

Is meet this guy online. He was very demanding for a picture of what I looked like. I sent. He then asked to see more boobs and was very demanding I don’t know why but I did. I know I shouldn’t have and I regret it even if he hasn’t have threatened. But he then asked to see my bottom I told him I was not comfortable and he kept asking. I then said I’m sorry but I can and this isn’t going to work. He responded with okay see you on pornhub. I panicked and cried and blocked him and deleted my account. But I’m really scared. What can I do and how can I tell if he actually posted me. Btw I am only 17. Not only that after reading other posts and things I’m scared to get in trouble myself for child pornography.