Jeanine, my husband is the same way.
When we took our first cruise (way back in '97) we had only been dating a couple of years, and we had a long distance relationship. I lived in Ohio and he lived in Boston. We were seated at a table for six, and it was about halfway through the first meal that I noticed I was doing most of the talking for both of us. He hardly said a word! It really shocked me, because WE talked all the time - I'd never heard him be so quiet. I mean, when he gets going, sometimes now it seems he never shuts up!
Anyway, we've been on plenty of cruises together since then, and I've always found dinner to be the most stressful for me, because he's pretty quiet until almost the end of the cruise. On recent cruises, I've opted for a table for 2, just so I don't have to deal with it.
I pretty much will talk with anyone, and I've met a ton of people while on cruises. Plus, these message boards are great if you meet someone prior to your cruise, and then you can get together with them onboard.
Andrea