You're waiting for the right person, you're too picky for your own good or maybe you just don't like the idea of sharing your queen-size bed with another human being.
We all have reasons why we're not in relationships and while some of us avoid relationships on purpose, others are left to wonder why Mr. or Ms. Right hasn't knocked on their door yet.
If you're looking for even more affirmation, you can always rely on Twitter. On Tuesday, #ImSingleBecause became an instant trending topic with thousands of responses and RTs. Even big names like Perez Hilton joined in, blaming the baggage he has to carry.
"#ImSingleBecause My baggage comes with a lot of weight and it's gonna take a very special man to be my mate! Plus, I won't settle for less!"
Other responses were less serious. We saw everything from not having enough time for another partner, to waiting for your celebrity crush to notice you and even cocky excuses like "I can't choose just one of the millions of women who want me."
Take a look at these other tweets and tell us your own reasons in the comments below: