I have cruised twice solo and twice with others, I actually had more fun solo!
I didn't get lonely, in fact, I actually felt I relaxed more traveling solo.
If I can offer a suggestion, if you are feeling apprehensive about traveling solo, look for roll calls for the same sailing you will be on and join the thread. On the Liberty in December I am cruising solo, but, have located a group on a roll call of about 70 people who are also cruising so I will "know" several on the ship this time which I think will be a total blast. I am so looking forward to meeting those on the thread!
Vicky, you will have a blast no matter if you are solo or with a group!