Neverwhere reading journal 1-3 revised

  Contents of chapter one to three contains Richard Mayhew's life in London and his life changing after meeting a girl called 'Door'. When Richard and Jessica was walking the street to meet Jessica's boss, Richard found a girl wounded on the street. Jessica saw it too, but she wanted to ignore Door. However, Richard didn't, and he takes Door to his home. After then, his life started to change. Nobody was able to recognize him, and chapter three ends as Richard meets the Rat-speaker.
  Where Richard meets the rat-speaker is underground. It seems like Richard had no idea if such a place have ever existed in London. Ever since Richard met Door, weird things happened. Everybody ignored him and Richard saw things that he has never seen before in London, such as underground, or the rat-speaker. Actually, it kind of seemed like he didn't even cared about it before.
But now, he is being ignored by everyone, but someone he has never heard of, or cared about such as characters from underground are the only one that don't ignore Richard. I wonder what this situation tells us. To me, it seemed like people in London above symbolizes wealthy or people who are part of the society, and London underground symbolizes the people who are ignored from society and live on their own without help of society. Therefore, I think situation that Richard is facing may symbolize the wealthy person starting to know about the ignored people after being alienated from society.
  After my thoughts about Richard's situation was pretty much done, I started to think about the character, 'Door'. Door is the one that changed Richard's life. It seems like she's the one who caused this situation. So I wondered. What does Door symbolize? She's the one who moved Richard to the other world, but why Door? After I thought about it, it seems like it relates with her name. Her name is Door. She's the one who moved Richard to the other world. It may symbolize the one that connects two different world, or society. I also think that Door may symbolizes the person that needs help. In this perspective, Richard represents a person who is socially active, but after he helped a poor people, he gets to go to the group of people that are ignored. It kind of seemed weird. Wealthy person becoming one of the ignored people for helping poor people doesn't seem right. However, I also thought that people doing good stuff becoming unfortunate might be the reality. I can't really think what the book is trying to tell because I've only read three of twenty chapters, but it's good to keep thinking about what contents in the book symbolize.