In everyday language, someone who says they "live under a rock" means that they are disconnected from current events or trends happening around them. When Mischa Barton mentions this, she is expressing her preference for living a life that remains secluded and focused on her own interests rather than being aware of the broader world outside.
The deeper meaning behind Barton’s statement reflects her desire to maintain a private and sheltered existence within her professional sphere—specifically, her involvement in film. This sentiment can be interpreted as an acknowledgment of her intentional separation from the public eye and media scrutiny. By choosing to stay within her "film world," she shields herself from the pressures and distractions that come with fame and public life. It suggests a conscious effort to preserve personal tranquility amidst the chaotic nature of celebrity culture.
Mischa Barton is known for her role as Regina George in the 2004 film "Mean Girls" and has appeared in various other television series such as "The O.C." Despite her successful career, she often speaks about maintaining privacy and avoiding extensive media coverage. Her quote encapsulates a longing to live a more secluded life focused on her creative endeavors rather than being in constant public view or engaging with the ever-changing trends of society.