There are no causes of poverty. To ask what causes poverty is like asking what causes coldit is the absence of energy. Similarly poverty is the absence of wealth. We should ask, ‘what are the causes of wealth?’
Self-confidence is confidence in the Atma; it is an unwavering love for the Divinity within you. That is very important. What will help you to develop that confidence? Be equalminded, be satisfied with what you have. Be happy.