In reply to Trevers:
> What do you think? Is any venture which has as an aim the building of confidence doomed to failure, regardless of the successful completion of the task?
No!
I think we should make choices that increase rather than erode our self-confidence. I used to do a job that eroded my self confidence, because I didn't believe in it. When people asked me what I did for a living I was embarrassed to tell them. When I was at work, I felt like a fraud, as I sat in meetings and had to spout off about stuff I didn't really know enough about. All of this was bad for my self confidence.
I'm now part way through a venture to work in a profession I believe in, and already it has increased my self confidence. When I'm finally qualified and experienced and actually good at it, I think that this will really help me feel more confident, as I will have put a huge investment and effort into changing my life, and achieved it successfully.
Even as a thoroughly pessimistic person, I still believe that success in this venture will increase my confidence (and it's going very well, there's pretty much no way I'm going to fail).
Confidence can come from knowing yourself well and making choices that end you up in the right "niche". Choosing the right people, relationships, jobs, locations, hobbies, etc all contribute to confidence. Poor choices in these things can erode confidence.