"Are you sure you're ready?" Translation:
Coming from an unmarried acquaintance, this sort of question is likely a projection of their own fears -- they're not in a position to make a lifelong commitment, so it's hard to imagine that you could be.Quick comeback:
Exude confidence and leave no room for anyone to debate if you or your fiance is in any way unprepared for what you're getting into: "Absolutely! We are completely in love and ready to be together forever."