"Am I really blind to it all or are people just really sensitive to these things?" Your mind/emotions might be tuning out in order to ensure you don't become even more crazy? Not saying I really know the answers but just speculating about one of the things you have probably already speculated about........
The mind is so mysterious and we have to be careful not to get to caught up in our thoughts. It is probably easier for me because I have had less trauma but I try to balance what I think with what I do by just trying to DO positive things everyday. I have always said to myself that what I DO in life is more important than what I think. Though it can be important not to turn certain thoughts into deeds that we know we might regret. I think if we can get ourselves into the right environment, it is possible to change some of our thought patterns but some of our deeds (attempts, crimes, marriages, births, etc.) can alter our future selves forever.