A creep I meet online

So, the other day someone on Instagram sent me a dm and, it was normal at first, we were literally talking about the new Stranger Things series, and then after a while the person went blank, only for an hour later they sent me a porno talking bout some the girl in the vid looks like me (mind you i'm like 15 and it says so in my bio) And I asked them why they sent me that and they said because everyone watches porn it's 'normal' and if I don't watch it then I'm weird, this made me severely uncomfortable (I mean who wouldn't be?) Then they starded telling me about how I'm still gonna have to have s3x in the future so they're just 'preparing me' for what's to come... I closed the app after that and checked again in the morning to see if they had stopped and they sent me two more attachments, both of girl on girl action... Yeah and they said that that could be me and them and that I have big b00bs and they like that, I felt so disgusted that I blocked then (finally)

What's funny is that this isn't the first time something like this happened to me before, people try to act all sweet online, but deep down some of them just want to use you :/