What should i do?

A person dm me, on pinterest, shes 16, i'm 19, i feel uncomfy talking to younger people, but idk if thats dramatic of me? I let her know i was 19, but she kept saying it's not a Big difference, and also just keep saying weird stuff like: "our friendship it's gonna be the best" "this feels right, the beggining of our friendship" "i really want to be friends with u" i mean, very insistent. I def don't like that. Also it's just pinterest?? I mean i'm that acount i don't have a lot of my interests , but shes keeps saying we have a lot on common. Idk it's very weird, but also i feel bad for that person, theres Bad people put there, but at the same time i know i can't 'protect them" I guess the obvious answer it's just stop they conversation but i don't know 😭