Glad to see that you decided to go -- you will absolutely love it! I have been thinking about trying a cruise on the MSC line, and would be very interested in reading your review.
On the last cruise I was on, there was a single guy in his mid-40's traveling alone. He had an absolute ball. Out of the 14 days, he only showed up to dinner on 3 nights -- his evenings were spent mingling with the hundreds of people he met. He was such a blast!
Enjoy -- I'm sure it won't be your only cruise!