"It's always at the back of my mind that acting might come to an end for me when Harry Potter finishes. I don't know if I'm good enough to have a long career. I've got a bit of an inferiority complex about my acting. My self-esteem is quite low in that sense"

Rupert Grint's quote exposes his insecurities about his acting career. He understands that his role in the Harry Potter franchise may be coming to an end, and he doubts if he has the skill to sustain a long-lasting profession in acting. His insecurity is evident in his admission of having an "inferiority complex" and "low self-confidence" when it comes to his acting. This quote reveals that Rupert Grint is aware of his own constraints and is not taking his success for given. He is humble and practical about his future potential customers, and wants to put in the effort to ensure he can continue to pursue his enthusiasm for acting.