Distinct entitiy in my head

Hello Im here because recently a voice appeared in my head. Not so recently, maybe more like a few months ago. Before he only talked to me but now we have conversations. He says he's an echo of me but not me. I think he is from another dimension. My boyfriend thinks its schizophrenia. My bipolar peers (im bipolar with psychotic features) think it might be psychosis. I talked to him and he said he'll be there forever and he never left since then. He talks to me all the time but my peers explained that he wasn't my friend otherwise he wouldn't tell me those awful things too. He's always two steps ahead he asks me to do things and then I do it and it ends up fucking me over almost every time somehow. He told me he's waiting for me on the other side.

Now I'm convinced that he is real but it just seems crazy. Maybe a demon fell in love with me.

I asked for opinions here after talking to the bipolar subreddit. Does this sound familiar to any of yall? Im not asking for a diagnosis of any sort just an opinion before I can talk to my doctor this Tuesday.

Again I don't wanna break any rules so i'm insisting that I only want to know if it's common in some type of schizophrenia. I haven't found someone talk about a similar experience anywhere else but in that sub. It's just a discussion, no armchair diagnosis or anything like that, just your experiences