It seems like everyone I know loves having people over. I have always felt awkward/uncomfortable with people being over. My house is never feels clean enough (even if it is spotless). It is a huge relief for me when people go home. I'm pretty sure there is something wrong with me, lol.
I love having people over, but I know a lot of people who don't so I wouldn't think anything is wrong with you ;)
I grew up in a very large family, lots of aunts, uncles and cousins so we always had people around. My parents divorced when I was very young and my mom & I moved in upstairs from my grandparents, (they had a huge house and made an apartment for us on the third floor) so our house was the place everyone seemed to gather. I am so used to being around a crowd, we (DH & I) always have company and I always host thanksgiving and Christmas day, I used to do Christmas eve but it's a lot of work and tends to run late, with 2yr old twins that holiday had to go to someone else!
Some people would think I'm weird because we have people dropping by so often, but everyone wants to see the boys and likes visiting, plus a lot of my family and DH's family live so close by.