TRAPS:  Admit to worrying and you could sound like a loser.  Saying you never worry doesn’t sound credible.

BEST ANSWER:  Redefine the word ‘worry’ so that it does not reflect negatively on you.

Example:  “I wouldn’t call it worry, but I am a strongly goal-oriented person.  So I keep turning over in my mind anything that seems to be keeping me from achieving those goals, until I find a solution.  That’s part of my tenacity, I suppose.”