The brain tends to focus more on negative thoughts and this is based on the instinctual parts of the brain. We can train ourselves to focus on the positives as well. Here’s a simple exercise: Write down 3 things you are grateful for and 3 things that you did well every day for 7 days. By doing this simple you can change your brain and you will see your self-esteem grow. The more you are grateful, the more you will have to be grateful for.