I used to be frighteningly under confident in social situations. And although people who know me now would never believe I used to doubt myself so much I literally had to learn confidence until it became a natural part of me. I can tell you relaxed optimistic confidence is just, well so much more fun.
Here I'll tell you about the things that made the most difference to my confidence levels...
Some people have naturally high levels of confidence but everybody can learn to be more confident
Firstly, it's important to get a clear idea of what self confidence really means, otherwise you won't know when you've got it! So, self-confidence means:
1) Being calm. For every situation in life you need to run on the appropriate level of emotion. Too much emotional 'leakage' into a experience can spoil the experience. You make great strides towards confidence when you begin to relax in a greater range of situations.
2) Being cool. The second part of self confidence is about being able to relax with uncertainty. To be 'cool' in a situation really means relaxing with not knowing how things will pan out. If you truly tolerate uncertainty, you can do pretty much anything.
3) Not being too concerned with what others think of you. You know when you imagine what some place is going to be like before you go there but when you get there it is totally different to your imagination? That's how reliable your imagination is! Stop trusting your imagination so much. I've long since stopped bothering to imagine what others think of me because so often I've turned out to be wrong.
4) Being specific - where do you want confidence? 'Confidence' is meaningless until you tie it to something specific. You are already confident that you can read these words or can switch a light on and off. So you don't need more confidence everywhere. To get what you want in life you have to establish exactly what you do want. Where do you want confidence in your life? Think about the specific situations now and write them down. You beginning to steer your brain towards confidence.