Check something off your list and feel more confident right now. Get in good physical condition. I'm not sure anything erodes our self-confidence more than being out of shape or overweight. It's difficult to feel successful just because you make a lot of money when you get winded walking up the stairs, don't like what you see in the mirror, or haven't got the strength to easily lift your luggage into the overhead compartment. The common theme to all these confidence-builders is action.
Inaction diminishes confidence and action builds confidence.
My ultimate confidence-builder was training for and finishing the Hawaii Ironman Triathlon, which I've written a about in an earlier column. If you want a megadose of confidence like this, do something that's hard, scares you, you have always wanted to do, have been putting off, and whips you into great physical condition. He will be speaking at LAMP 1999.