America needs people like you. The list goes on. First, remember your folks love you and care about you. They want you to be happy, secure, engaged in something meaningful and hopefully not too far away. Your best bet is to answer questions clearly and to the best of your knowledge.
Parents have a right to some reasonable answers.
No parent wants a moralistic lecture from their son or daughter. Getting angry or indignant about their questions won't help either. Here's a few ideas. They divide into ideological responses and practical explanations. What I'm doing isn't so strange.