"1. what's the difference between an excuse and a reason that something happens or is done. 2. How do i expect him to grow up from him without nagging and acting like his mother? 3. How do i expect anything of him and then not be dissappointed when it doesn't happen?"
I really think you are quite capable of answering your questions. I'm no expert on this so take what I way with a pinch of salt. I could be wrong but I thought you may want to read this article. I saw myself in it http://www.coping.org/relations/martyr.htm