I think the easiest way to get confidence is to just flat out confront the things that make you lack confidence. Unhappy with your body? Go work out and be happier with your body. Don't feel you're interesting enough? Develop a hobby, dig into it.

The easiest way to believe in yourself is to give yourself something to believe in. Don't look at others. Look at *yourself* and what you want to be *for you.* Then work towards that. I haven't known many (any) people who looked inwards and started working towards who they really wanted to be who still struggled with self confidence issues.