Hi Fleury, I'm sorry you're having a hard time
To me it sounds like you're struggling with a couple of things (just IMO!!) like self esteem issues, trust issues and some of people you may be talking about.
This: ".........telling me a real story, or something they just made up because they don't really want to talk to me?"
Maybe you're being a bit hard on yourself there, maybe people are going to want to talk to you more than you think?? So the stories may well be real..........but from the other side, some people may make up stories for the very reason that they do want to talk to you........it's just that they've nothing else to say or want those stories to make you notice/remember them.
And: "everything everyone lets me hear is just stuff I said to them the last time"
Maybe again they haven't got much to say...........maybe you've made a positive impression on them with them remembering that stuff??
And..........people stopping talking and going into a fake conversation.........I think sometimes if your self esteem is just a little shaky it's real easy think that's happening or if it is then to take that personally. And if it does happen anytime I'd say that sometimes we just need to respect that some people might like to keep some things private, it doesn't need to be anything about/to do with you that they're keeping things quiet.......just the way we are........I'm sure you'd like some conversations to be confidential "just because" as well, hey??
And if those fake conversations are similar to things you did or said.........well maybe just grasping at something to say and you've triggered something for them........or they're not fake and just total coincidence??
So maybe have some conversations with these people about how you're feeling, "call them out" on some of the things you think might be going on. Might be some reasons behind those things which you can resolve with them, or might not be, in which case.......time to completely distance yourself from them.
Just some thoughts..............

Alison