I believe the answer is: Inferiority
According to erikson's every individuals have the need to have a sense of belonging/to be accepted by other members of the social group.
If they fail to achieve this, they would start to think that something is wrong with them and started to develop the feeling of inferiority.
Answer: Evan just used the process of metacognition.
Explanation: Evan decided to come over the disappointment that he had and consider what would be beneficial for him. He considered giving more importance to his passion for music and not the position. He came aware after thinking of the opportunity of learning that he would have in the band that he was selected in and thus decided to pursue it. He rethought his decision of quitting music and accepted what he was getting. This process of coming aware of the thoughts is known as metacognition.
