You must concentrate on your successes and forget about your failures and all the negatives in your life, if you want to set yourself up to win.
The best way to build true self-confidence is to start off with the small goals that you can easily win at, and then try your hands on harder goals when you have built a stream of successes that makes you feel good about yourself.
Starting off first with the harder goals that are too difficult to achieve, often makes us quit easily as we are quickly discouraged about our abilities. Make sure that along your journey, you keep track of all your achievements, both the small and big, to remind yourself of the times that you have done well.
Just as you have a ‘to-do’ list, create a ‘did-it’ list that helps you reflect on the major milestones, goals, and projects that you have reached, achieved, and completed respectively. This is a great way to reinforce confidence in yourself and your abilities.