You should always get a second opinion or more for any kind of serious diagnosis. Doctors are only human and they make mistakes too. However, I don’t think anyone here can ethically give you medical advice. I think a lot of people here are struggling in life to some extent. I’m no exception. I hope it works out for you though.
We all have various states of inner dialogue. Your functional thought will have a bearing on how you think and interact with others. Some people have a rich inner dialogue. I do have a rich inner dialogue, but it is not with other people per say. I enjoy thinking in terms of how someone else might view me or some event, but it is never persistent.
One thing I like to tell myself is that everyone has moments when they show some kinds of signs of mental health problems. That is perfectly normal. It is only a disorder when the problem is impacting your life in a way that you are unable to address.