I'm not phased by the death of my mother
Why do you feel that way about your mother's passing?
I just didn't like her very much, and now that she's dead I don't feel much of anything.
Not everyone has the same reaction when a family member dies. People express their sorrow in different ways. If you didnt feel very close to your mother then this could be part of it as well.
I am smart enough to know how I am feeling. I just don't care about her passing.
Some people just don't get along with others no matter who they are in the family, it is okay in that regards. Just move on as if you were just living as before. Death isn't always a bad thing either, but if others want to be sad that's fine too.