I've just joined the network today after searching for answers for years. I have been intensely DD for over a decade now and never knew that it was a "thing". When I was younger, I always kind of assumed that everyone else had a second (or third or fourth) life that they lived inside their heads. It wasn't until high school, when I mentioned it to a close friend, that I realized how unusual it is to constantly and vividly DD. I just thought everyone lived a thousand different…