Do your dreams often have repercussions on your reality?

For example if you dream someone has been unkind to you and you are aggressive to them in the dream, when you later see them in real life is some of that aggression still there?

I am more and more finding that I am having arguments with my friend in my dreams at this moment in my life and I am finding it hard to distinguish between whether some of this anger is through real stuff they have done to me or whether I have just dreamt it. I also feel that because of these dreams I have drifted so far apart from them that I cannot consider them my friend any more.