When asked, "Who are you?" 15-year-old Samantha answers that she is a sophomore in high school, that her favorite music artist is Taylor Swift, and that her favorite television show is Once Upon a Time. She is describing her:

Samantha is describing her self-concept.

Explanation:

In psychology, we can think of self-concept as the beliefs we have about ourselves, the way we perceive our abilities, behaviors, and characteristics. It is our self-concept that usually answers the question, "Who am I?". Self-concept interacts with self-knowledge and self-esteem, forming a mental picture of how we see ourselves. Examples of sentences that express self-concept are "I am a good daughter," or "I am a skilled athlete." When Samantha says that she is a sophomore, that she likes Taylor Swift, or what he favorite show is, she is describing her self-concept - her ideas of what defines her.