Autobiographies and motivational books can be great, but as most of them acknowledge themselves, just reading them is not good enough, you have to act yourself.
We are all better, stronger and capable of so much more than we think in life. The world is full of people who will chip away at your confidence, surprisingly a lot can be people we consider friends. This is because they are terrified if you succeed you will leave them behind and often you do.
One interesting autobiography I read was Watch my Back by Geoff Thompson. A kid who was bullied and scared of his own shadow who went on to become a nightclub doorman and one of the toughest men in Coventry. He was sweeping floors in a factory too, started writing and became a top author, bafta winner and screenwriter. If you speak to most famous and successful people a lot were told they wouldn't amount to much in life or would never make it. Plenty will say they winged it too.
Life is simple really, do what makes you happy. Some people will stay in a minimum wage job with the same company all their life, never travel or get promotion but are satisfied and happy. Good health and luck plays a big part too.