I pretend to know what I'm doing when I really don't for one thing. Then when people try to help me I wave them off, I even feel offended for them implying that I need help. Which has led to, for lack of a better phrase, the failure of major projects in my life. If I had fessed up to the fact that I had no freakin' clue what I was doing in grad school 2 or 3 years ago I might have completed it successfully, but I couldn't even admit how much I was struggling to myself let alone my advisor or anyone on my committee or my colleagues.