The best investment is the investment on your brain. Jewelry, money, land, or flat nothing makes a person confident. A skilled person is a confident person. Develop your different skills and despite our busy work life, keep some time for brain work. You must start investing some of your time and few money each month into your brain. Believe me, it will make you confident, remove your identity crisis and make you a skilled person. Only brain work and skill development can make a human being confident.