when i was single, i received lots of questions like that. Yes, it did annoy me for a while. Then later, I decided to ignore those questions. Just smile when they ask. Some people just can't leave singles alone.
Actually, I just joke it around when people ask me. It's not bad to be single but it's not also bad to have someone to care for and who will care about you.
Hmmm.. Not really, because I see more and more people who are married and miserable everyday. And most of the married people tell me they'd rather stay single than go through the difficulties in life.