"I've pretty much behaved like a knucklehead my entire life"

In this quote, starlet Cameron Diaz is confessing to her previous errors and acknowledging that she has not always made the very best decisions. By using the term "knucklehead," she is describing herself as someone who has actually acted mistakenly or recklessly. This expression recommends a sense of immaturity and impulsiveness. Diaz is owning up to her past habits and possibly even expressing regret for it. Nevertheless, making use of "basically" indicates that she might still have moments of behaving like a knucklehead, but in general, she has actually gained from her mistakes and grown as a person. This quote shows Diaz's humbleness and self-awareness, making her relatable to others who have actually also made mistakes in their lives.