Why does the narrator describes her memory of approaching adolescence as something unknown and therefore terrifying?

The narrator describes her memory of approaching adolescence as unknown and terrifying because it represents a significant transition filled with uncertainties and changes. This period is often marked by the complexities of identity formation, social dynamics, and emotional upheaval, making it daunting. The fear stems from the anticipation of losing childhood innocence and the pressure to conform to new expectations, amplifying the anxiety surrounding this pivotal stage of life. Ultimately, the unknown aspects of adolescence evoke a sense of vulnerability and apprehension about the future.