My lack of full confidence is shown by my urge to compare myself against Travis Bradberry's list of the habits of genuinely confident people. These six I do OK on: 

1. They speak with certainty
2. They seek out small victories
3. They exercise
4. They take risks
5. They aren’t afraid to be wrong
6. They celebrate other people’s successes

But my insecurities show up in trying to impress other people. I don't let that get in the way of being my own person. (It would be quite hard for me psychologically not to be my own person even if I tried.) But I definitely

• Care about what others think of me
• Worry about whether I measure up
• Seek attention
• Talk too much

On talking too much, I have noticed that in addition to a high intercept on talking, I have an anomalously small negative elasticity of talking with respect to group size. Thus, the bigger the group, the higher the ratio of how much I talk compared to 1/n. I get the closest to talking a reasonable fraction of the time when I am talking to just one other person. 

They say confession is good for the soul. We'll see.