One possible story for your theatre solo performance could be about a girl who is struggling to find her place in the world. She is constantly bombarded with school stress and the pressures of growing up, and feels like she doesn't fit in with her peers. One day, she creates an imaginary friend to help her cope with her problems.
As the story progresses, you can use movement and music to show the girl's emotions and struggles. You can show her feeling isolated and alone, and then slowly introduce her imaginary friend as a way to show her coping mechanisms. The imaginary friend can be a symbol of the girl's creativity and imagination, helping her navigate the challenges of growing up.
Throughout the performance, you can use dance and movement to convey the girl's emotions and struggles, while also showcasing her inner strength and resilience. The story can end with the girl feeling more confident and secure in herself, with the support of her imaginary friend and her own inner strength.