Do you know someone who is extremely into themselves. I do! At first I thought she were someone that was just confident in herself. Now, I believe she is obsessed with herself. Then I asked myself, can a person be obsess with themselves? How do you become self absorbed in the first place.
I believe it starts off by how a person were raised. For an example, I know lots of people have seen the show Toddlers and Tiaras. When you are young and you constantly have people praising everything you do; a child can grow up believing that they are perfect and that they can do no wrong.
When you are in adulthood you still believe the world revolves around you. so, when you see people that are self absorbed, think about how they were raise to be that way and look at their parents.