Just thought of another that should have gone on my personal list. I have a tendancy towards secrecy/protectiveness of anything that I feel others whose opinions matter would really dislike. This can be pretty innocuous (no one needs to know my secret affection for Phil Collin's Groovy Kind of Love), or it may be that I don't have different groups of friends meet each other if I don't think they'll hitch (that emotional surprises thing again) or sometimes when I do/don't do something that I feel bad about and don't want others to know.
This is where it gets most serious and it leads to sins of omission or a little lie, but the cavern just gets deeper the ground seems to split further and further apart. Then it's hard to backtrack and set things right again. Not only does this go against my value system and my profession of being a Christian, but secrecy always takes on a life of its own. What may start out as saying you've done something that you intend to do later that day, becomes a much bigger deal the longer it goes on. It comes between people and compromises the trust that should be there. It stems from not wanting to disappoint others, but really is a form of pride and not taking responsibility for your behaviour or decisions. This one I have worked on a lot through the years and I think am much better than I was. It is a trait in myself that I truly despise and see as being very destructive.