We are not all born with super confidence. I know I wasn't. I certainly at times have known how to fake it and muddle through. I actually can honestly say I perfected it. It took me years to learn how to stop judging myself and find peace. Over those years I learnt that true authentic confidence and self belief, takes time to nurture, build and grow. It can also through life challenges, take a pretty strong bashing. How do you rebuild your mind and create lasting confidence when your perhaps at rock bottom, don't particularly like the world, feel wounded and perhaps put into a box?
Well simply put, I believe you do it one thought at a time.
Write something about yourself. No need to be fancy, just an overview.