I resigned today. What should I say when I get home?

There is a reason to resign. I don't want to say anything about the reason for your resignation. Just consider how to explain my point of view to your parents. First of all, explain that you still have your parents in your eyes and know their hopes. That's not enough! Second, adjust yourself to find a job immediately. Third, don't tell your parents, lest they worry about you. Tell them when you find a new job. Everything will be fine by then. If you resign again, even if they know, they will think that you have the ability to stand in the society and won't worry about you anymore. Try to make the elderly worry!