I didn't seem to have a problem dating, until I realized I wasn't dating at all - I was with guys who wanted to be with me physically but not emotionally.
It could be a lack of physical attractiveness, it could be so many other things. I think I am or was suffering from low self-esteem, I can be very aloof, but I'm also confident in myself if that makes sense. I'm also very honest and very straightforward and I understand that men don't necessarily like that. I'm pretty smart too, which can be intimidating.
I think that a combination of these factors led to me making bad choice after bad choice in the dating department, and I've totally stopped dating altogether now. If the right guy is out there for me, let him come and find me!
So I'm single, not entirely but mostly by choice. Not the same as having dating trouble, I suppose, but definitely better than the 'relationships' I was in before.