3th of Class- Within you, there are two

This class was deep, it really made me think about my past what was that situation that happened in my life that made me who I am today. While he was explaining the class I was paying attention to what he was saying, then he started talking about the past which made me think about my past so he said that if we are thinking about the past we are not present in the present so I was really confused because how can't I be present when I'm listening to what you are saying and thinking about my past? In some way I undestand what he was saying but in other way this was really confusing. Then, he said one person is two people that we have a relationship with ourselves. The way he said it sound crazy but I always felt that I have someone inside who tell me what is wrong and what is right but I don't think about it because sometimes life and some stuff does not have any explaination. However, if you think about it he is right, but usually people do not act or feel with "the self" but with "you" the one created but the society, the environment where we grew up in. But when you behave with "the self" the pure-nothing is the only way to reach happiness.