Hi vickeysid, you are in for a wonderful time. I've cruised by myself and absolutely had a ball. You don't have to do what someone else wants to do, you can go when you want to go, and best of all-no one is snoring in your room
I met others on board that were single. On one cruise I was seated with a family of 5, they were really great people. Even though their children were younger than I, they liked snorkeling, so we had fun snorkeling together. On the other cruise, I was seated at a table with 2 couples and a family of 3. They were all fun people and we did do a couple of excursions together. Like queenofcruzin said, if your tablemates aren't a good group, don't hesitate to request being moved. You'll have a wonderful time. Best wishes!