Had a weird experience need advice

I’ve been having really weird experiences since I was a child about voices and personalities and that sort of thing, I never really thought I had DID but I have been on the process of being diagnosed with some other stuff such as BPD and ADHD autism etc. But last night I was just doing my own thing and I realised that there was a conversation going on in the back of my brain between two people. One of them seem to be me and one of them seem to sound like one of my friends, usually I do have fake conversations in my head but I’m the one responding but this was very different. This was two people having a conversation in the back of my head without me even realising it.
I over analyse a lot, and this could be so many things and I just wanted to bring it up here to have a second opinion I guess.