My girlfriend and I live together and frequently see her family 2-3 times a week - each of these times being an all day event that I get feel guilted into going to by my girlfriend. It has just been too much for me. I'm happy to see them occasionally and do my duty so to speak, but it's just been too frequent for me. In no universe do I want to prevent her from seeing them, but I feel that I need to be opting out more often than not recently. She has gotten frustrated with me whenever I opt out. 

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Her family are genuinely great people, but it is exhausting being with them. We connect politely, but I don't really have much in common with her parents or her sister. When we're over there she is enjoying her time, chatting, doing whatever -- but I'm always left twiddling  my thumbs (and I try to make small talk, connect, etc.). I swear I have tried, but the experience is 9 times out 10 just immensely boring - and I feel that I need to be sort of "on my best behavior" - which is exhausting. What can be frustrating too is that she'll go off with her sister and literally ignore me when I try to continue a conversation with them -- or just hang out. I get that seeing her family is a part of the deal, but spending time with them is killing me and I don't get why I have to be there along with her so frequently. 

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Case in point: we went to her family's for Thanksgiving. We were there for the day, awesome, cool, normal Thanksgiving. Then, it's like 7 pm - about time to leave right? Great to see you, hugs, bye - then, she decides to sleep over. She poses this as a question to me - but it's not really a question, it's an answer yes or I'll get teary eyed, pouty, and become a mute for the rest of the day. So 7 pm to 11 pm is spent watching fucking America's Funniest Home videos with her family, who I've already spent \~10-15 hours with that week -- and literally just kill me. The next morning we are then still there until like 1 pm - she's talking to her parents about different things, while I am twiddling my thumbs. 

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So, this sort of a came to a head today. She's going over her parents to make perogies for Christmas. I offered to come for 4-5 hours to help out. She was less than content with this idea. She told me she doesn't know when she wants to leave (read: we will be leaving at 10 pm and the entire Saturday will be spent with me attempting to make small talk and twiddling my thumbs). I offered to drive my own car and leave after the 4-5 hours. Same answer. I can't imagine that I was being unreasonable. 

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Am I the asshole and does anyone have any advice moving forward?