Well, I certainly don’t think you’re delusional. I have DID and I relate to a whole it of this. The first one of mine who started talking to me really freaked me out. Of course he’d been talking to me for years but I just thought everybody experienced internal voices. The second one, a little boy named Ash, started writing notes to me. It was very strange because he wrote everything backwards in red pen. Now I know them better and we cooperate a lot. I have quite an interesting family of persons in my head. They sometimes come out and do their own thing, but at least we communicate about things.
Personally I think you’re on the right track and your attempts to communicate are good. It also sounds like you can sense them a bit.
In my experience, it was less scary to think I was somehow making it all up, because if they weren’t real enduring parts of me then there was a whole lot of stuff I didn’t have to deal with. One of my insiders wrote in our journal that it’s amazing how much credit I give to my own will and imagination, as if I’m even capable of making these things happen somehow.
There are lots of people who share similar experiences. You don’t have to be all alone in this. I have found a lot of comfort and insight from the people of this forum.