Pride?
Skeets, you do not lie very well just yet. MOST brown nosers are not sincere. They are just putting on the ritz.
You were not raised in a religious fundy home, else you would be a repressed, bloodless, sociopathic sycophant by now. You would be able to vomit, cry apologize, confess, charm, and/or kiss ass ON CUE without actually feeling any genuine emotion. (You would be a lil bit dead behind the eyes, doe.)
Start by telling people what you want them to know, but not until you want them to know it. Your point of reference should be strategy, not truthfulness. Quit being so emotionally honest. You do not have to win every squabble or impress every passerby. The important thing is that you get what you want.