So, why are you single? Is it by choice? Is it not by choice? Yes, it is by choice for me. I am in no rush.
Is there something wrong with your personality? Definitely.
Is there something wrong with theirs? Probably...we are all sinners saved by grace, after all.
Is there a medical reason? Not that I'm aware of...though I'm sure if I went to a psychologist or a psychiatrist they'd say that there is one.
Is the reason biblical? Hmmmm...well, the Bible says that it's a good thing to marry and a better thing to remain single, though I don't use that as my reason, but there you go.
Spiritual perhaps? Definitely. I am content completely to wait on God and His plan for my life, regardless if that means marriage or being celebate and single forever...I pray for the second life but I will willingly surrender to marriage if that is what God wants for me...but I'm praying not.
Mental or physical? Definitely. There are reasons besides the obvious that give me serious pause in this area...I won't go into those here...
You have picky needs? I am EXTREMELY picky, but seeing as I am a princess and a valuable treasure, I believe I can be picky.
Are you somewhere with slim pickings? Always have been...back when I was a teenager, it bothered me, now it doesn't.
Is this too personal to ask? Probably, but I'm answering anyway.
Are you scared to ask them out? Personally, I don't believe women should ask men out and I absolutely refuse to do so. This is not out of fear but out of the firm understanding that I am the daughter of the King and I will not chase after anyone but Jesus.
Are you silently discouraging yourself? Nope...I loudly discourage myself.

Love, love, love being single.
Do people think you're over confident? I have my moments but not in this area.
Are your standards so high you can't find them? My standards are extemely high. I am not looking, so that's possibly why I won't 'find' a husband. But this is something God and I have discussed. As the DC Talk song says, "God will bring her to me so I don't have to search." Yup. If God wants me married, no power on earth can stop Him from bringing my husband and I together...except, of course, my own stubborn free will...or his.
Do you even care to make a change/improvement to what ever or who ever you are? Of course. I strive daily to be more like Christ and to change from glory to glory. I am brutally honest regarding who I am...I hold no false beliefs...and I know I'm a work in progress saved by grace.
Why are you single? First, because I love being single and secondly, and more importantly, because God has me this way for this time according to His will and plan for my life.