"If you haven’t realized it yet, no one is perfect. Many adults with ADHD may struggle more than most other people in life, and their self confidence may take a pounding because of it. This is because when adults with ADHD go through life with negative thinking, it makes sense that they may develop a negative attitude as a result. /.../
Low Confidence Doesn’t Define You - When you lack self confidence, it can make you feel like you are not good at anything. You see your entire life of insecurity and self doubt. You don’t have to be perfect to be successful. In a matter of fact, you can be confident in spite of your imperfections. Confidence is a state of mind that allows you to move past your failures and flaws and even learn from them.
Understand the Underlying Cause - By examining the reasons behind your confidence problems, you gain control over them. When you recognize the root cause, it no longer holds the same power. Just because there is a source for your insecurities doesn’t mean that you must live with them forever."