Dealing with housemates

I am 31 and he is 40. Definitely too old for roommates. He owns a very nice spacious home in a private upscale neighborhood. I am suppose to be moving in with him in 8 months. We are engaged. He is currently unemployed psychologist having trouble finding work in a very small town. He also has a martial arts studio in this small town which makes leaving difficult. To make extra income and save for other business ventures he is renting out 2 rooms in his house. I am a extreme introvert and I hate roommates with a passion. I don't mind living with him or any possible kids but randoms, NO. I hate having to make small talk every time I move around the house, having their gfs over constantly, and just not having a place to go to recharge after a long day. I don't like being around a lot of ppl when I am trying to recharge. I visit on weekends. I am here right now, thinking of leaving to my studio because I am getting tired of all these ppl. I want to lounge in my undies and watch chick flicks and dance to music, but I can't do that. This is making me stressed. What do I do???