I wasn't sure when I booked it, but once I got on the boat I knew it would be fine.
I met a ton of people and I was amazed that people were so willing to invite me to join them for dinner, shows, etc. I ended up meeting a couple from Houston and spent quite a bit of the trip with them and I think they will end up being life long friends.
I only had one odd incidence and it was actually with another women that seemed a little odd, but was nothing really.
It was great to have a cabin to myself, do what I wanted, when I wanted.
I wouldn't hesitate to do it again. The only change I would make, is that I would make sure I had some type of excursion planned in every port. Even if it was just an hour tour around the city or something. The one day I didn't have anything planned left me a little lost.
If you've been trying to decide whether to go solo or not, I would encourage you to try it once.