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How to believe in yourself
Make a list of your past accomplishments.
Writing out a list of your accomplishments will help you begin to believe in yourself. Sit down and make a list of all of the things that you feel you have excelled at during some point in your life.
Include even the most minor activities, like putting together furniture from ikea or organizing a party for a friend or family member. After you've compiled a short list, try to find patterns in the activities.