as I find myself over thinking conversations in my head that may or may not happen.
That's not OCD. That's just plain old brain chaos with a touch of narcissism and egomania on the side. Everybody's got that! If you think yours is bad how do you think novelists feel. They have complete conversations in their heads between people they know for certain don't exist and can't get a word in edgeways!

To give you an idea I said that last sentence in my head like 3 times before I actually wrote it. Then I edited it another 2 times.
Seems pretty normal to me though with the evidence from this site that sentences from a lot of people do not appear to have passed through their brains either before or after being written down I can kinda understand how you might get confused.