dream analyliss

I have a friend who once told me that all the characters, things,places in our dreams, however significant or insignificant they are, are representations of ourselves. Of how our subconscious views ourselves, our actions, successess, failures and embarassments. What is usually highltghed in our dreams are the most affecting emotions we had for the day or the ones we had that had the most impact in our lives. I had some incidents that I felt I have been to that situation before and I can predict the outcome, it comes to me as deja vu, and I would realize that I had a dream just like the situation I am in at that time. I still have no idea why I experience those things.