Not going on boyfriend's family holiday

I'm feeling a bit bad about not wanting to go on holiday with my boyfriend and his family. It is his parents, his sister and her boyfriend, so I will be the odd one out if I don't go. Thing is I know I will hate it. My boyfriend has pretty much said he is doing such and such this day and that day and going to the pub every night, leaving me alone in the middle of the countryside most of the time. I just don't feel I would enjoy it. It is not my idea of a holiday. I don't feel bad in terms of guilt, but I get very paranoid that I will miss out on 'bonding time', or whatever. Seeing as his sister and her boyfriend will be there. I get very paranoid about this and feel it would leave me outside the circle if they all go on holiday together. I know it's a bit of a catch 22, because I really don't want to go, nor do I want to miss out on attempting to get into the family either. I don't really know what I'm asking, it is just getting me down a bit. I suffer from depression and anxiety and I tend to get very paranoid about things like this and imagine situations in my head that are an exaggeration, and I'm doing this at the moment. It is driving me mad.

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