Roommates are always home?

I’ve been happily living where I am for about a year. I have a busy work and school schedule and I visit family and friends a lot, so I’m usually only home about three nights a week and an occasional weekend day. Maybe their schedules changed or I’m just noticing this, but I’m starting to realize that every time I’m here, my roommates are always home and in the common areas. They’re doing perfectly innocent roommate-ey things, like cooking, watching tv, or playing video games, and they’re friendly when they see me. It’s still starting to drive me crazy. :(

I’m normally a pretty social person, but this reminds me of living in the freshmen dorms, and I’m turning into the creepy recluse who retreats to their room all the time. I hate being Mrs. Rochester! It’s so not me, I just feel tense with all these people around. It’s not like I can ask them to leave more, because we all pay rent and have a right to use the space. Plus it would be totally presumptuous. I know that my behavior lately is really off-putting/ giving them the heebie-jeebies. I like them and they have some great qualities- they’re all neat, fun, nice, great cooks, and reliable, so I’d rather keep living here. I just want some alone time to unwind sometimes. So what should I do/ how do I get over it?