Reese Cup, you will be just fine, my first Solo Cruise was to Alaska. The ship HAL
People will know you are Solo, They just come up to you and start a conversation, which I also have a hard time with. I had some good table mates, it was suppose to be a table for six but only a couple showed up and another older single lady, that had some wonderful stories about her trips Solo. I did not hang with any one , Always fentured out on my own. But you will see the same people everyday.
I loved the fact I was in a cabin by myself, If I wanted to so something or not it was my choice. I did eat alone for breakfast and most of the times for lunch, HAL gave a wonderful meet and greet luncheon,
I've also cruise with other people two time before, It feels so much better in a cabin all by myself. Have a great experience, it's all what you make it. You didn't say were you are sailing to.