I was watching on YouTube videos about how to develop self-confidence because I have none, and I cannot do anything because of it, and the message was that self-confidence is purely a state of mind, and is not a result of achievements and competence. It is about imagining you can do it. But how could you imagine what you can achieve something, while your past experience is full of failures? Is it just some delusional tool just to keep trying and not give up? But I guess it's true. I know people who have achieved less, but still more confident that me, in how they speak and in how they conduct themselves, but why and how?