No, 'I Am All Girls' is not based on a true story. It's a made-up narrative designed to engage and captivate the audience through fictional elements and plotlines.
It could also suggest that the individual is representing the essence of all the true stories that girls have. It might be used in a context where the person wants to convey that they understand and can speak on behalf of the real - life events, emotions, and challenges that girls encounter in different cultures and societies.
Maybe it's a story of a girl who travels around and meets different girls from all walks of life. She absorbs their stories, cultures, and experiences. And in the end, she feels like she has become a sort of amalgamation of all those girls she has encountered, thus 'I am all girls'. It could involve tales of friendship, love, and the pursuit of dreams that are shared by girls globally.
It could be a story of empowerment. Maybe it tells about how girls overcame obstacles in a male - dominated society. For example, in a STEM field where girls are often underrepresented.