Always be professional and courteous. For your answer, you don’t want to be boastful or arrogant. Show humility as you progressed from your weakness. Alternatively, you don’t want to be too timid or underestimate yourself either.
Striking the right balance between confidence and grace is the best tone to adopt in your interview. Practicing, rehearsing, and setting up mock interviews will help you iron out any wrinkles in your demeanor and tone.