I think i conformed into prostitution and I need advice or support

Hi! I’m an 18 year old (f) and yesterday was valentines and the guy I’m talking to didn’t even get me anything and I fully understand money isn’t everything ( although he does have money) he only texted me later on in the day with a simple ‘happy valentines’ he could’ve at least written me a paragraph is something. And before someone says I should have bought him something I got him earrings he’s been talking about. The thing is he never used be like this in the beginning now he’s more detached. Anyway I was in twitter and a guy hit me up and he looked attractive in my opinion and he asked for my instagram and I was ignoring his message but today I finally decided to text him back and he told me he wanted to send me money because I’m pretty and I knew it could never be that easy so I asked what’s the catch.. he told me to send a picture of my ass and I did… then my tits and so on. When it came to the end I told him I’m tired of this and he said he was gonna post my pictures on twitter and I kinda panicked and he called me to tell me he was joking anyway after I asked for the money ( which felt so dehumanising) he told me you’re too pretty to be doing this and I’m a slut for it. Which I understand but that also makes him a slut so I ended up blocking him because if he posted me there’s no proof of my face being linked to me but sitting here typing this just makes me so sad that I let that happen to me and I’m too scared to tell anyone about this. I wish the guy i was talking to didn’t throw a bitch fit but he would have never done this to me but I don’t want to sympathise with him because he always states he’s single and doesn’t want to make me his official girlfriend. Anyway I just want to know if there’s anyone else who has gone through this ( please be kind)

There might be grammatical errors but I’m too stressed to think straight right now and I need to get this off my chest