Well... no… I personally don't think everyone has a passion. In fact, I'd venture to say only a few lucky people ever really develop a passion for something. Most of us just kind-of slog through life putting one foot in front of the other day-after-day. So my inclination would be to say, in that sense, you're probably more like the average person than not. But, of course, if depression is something you struggle with, then that's certainly going to contribute to you not being able to find anything you feel passionate about too.

Your post does bring up a good point with regard to job interviewing though. Successful job interviewing is a skill you can develop. And the more you do it, the better you can get at it. Most interviewers tend to ask similar questions. And so it's worthwhile to think about how you would answer questions, such as the ones you've mentioned in your post, before you get into an interview situation. Then, when the interviewer tosses out a question such as "what gets you out of bed in the morning", you're ready with a snappy answer! It doesn't really even matter if it's really true. What the interviewer is really interested in is how you handle the question, not what your particular passion might be.

So, after each interview you go to, think about the questions you were asked & how you replied. Were you prepared with a positive response or did the question catch you off guard? If it caught you off guard, spend some time thinking about how you might answer that question more effectively should it be asked again during subsequent interviews. Chances are, if one interviewer thought to ask it, you'll be asked a similar question again.