I have felt similar during an interview. For a teaching job, I once said I like teaching "to get out of my head". I don't know if that was such a good response. But, hey. We all learn somehow. I know this thread is from a long time ago, but keep your head up!

I said I like teaching to get out of my head, and that happens to be true, but it's not the best thing to divulge to an interviewer. I should have just made up something else.

Sometimes sharing less is more appropriate than sharing more. Every person in the world is not necessarily out to be your friend.

But when the interviewer asked you those personal questions you could have either been like, "I don't feel comfortable answering that", or the other option would have been to not bring it up at all and just make up another reason (real or not) why you want the job. It's good to prepare for situations like that ahead of time.