If I were you I would try your best to become accustomed to their way of life to be honest. I'm pretty much the exact same as you. I come from a very working-class (and mostly divided) family, whereas my boyfriend's household is a quite well-off 'unit' setup. At first, spending time at his made me feel very self-conscious and uncomfortable. Like you, I'm used to taking meals by myself and generally being very independent, so this community set-up was very strange. But instead of fighting it, try and see the benefits. You'll grow closer to his family, and as you say, they're nice people and just trying to be inclusive and friendly. As time goes on, this awkward conversation thing you're experiencing will fade away too, as you'll learn more about everyone's lives and find more and more common ground to talk about. (As an example, if you go to this villa with them, the trip will be something you can talk to them about in future!)
I mean, if you really don't want to go there, say to your boyfriend and he'll probably understand. But he's got this family for life, and, if you're serious about this relationship, I really think its worth making the effort to be part of it. Think about him: you and his family are probably the most important people in his life. I'm sure he'd rather have you all together than have to try and juggle to keep you apart. Even though I don't really enjoy my boyfriend's family's way of life per say...I'd still say its definitely worth it just because it makes life easier on him, and hell, they're nice people.