"I never had any acting heroes. I never really went to the theatre"

Julie Walters' quote recommends that she was never ever especially influenced by any specific actor or actress, nor did she have any particular affinity for the theatre. This could be translated as her having a more independent approach to her craft, as she was not influenced by any particular actor or design of performance. It might also be translated as her having a more practical approach to her craft, as she was not particularly interested in the theatre and instead focused on sharpening her own skills. This might be viewed as a sign of her commitment to her craft, as she was not sidetracked by the glamour of the theatre and instead focused on her own advancement. Eventually, Julie Walters' quote recommends that she was a self-motivated and independent star, who was not swayed by the influence of others.