Is it normal that i love to be alone?

I have a month off from school and work, and have spent maybe 80% of it hanging out in my room, reading books, trying to learn the sewing machine and scrawling poems onto leftover flash cards. My friends call me to do stuff a couple times a week, and I usually accept because I do enjoy having someone to pass a bowl or just talk to every once in a while. However, I can't wait to get back to my room and finish the latest book I dove into or try to sew something in a straight line. Also, when it's a party invite- I almost never go. I'm not a snob but I just can't get a kick out of them, coke leaves me flat and I don't like getting that drunk. It doesn't feel good, and the next day is worse. Parties used to be nerve-wracking, but now they're just a bore. I tend to be very quiet and have maybe two friends plus my boyfriend in the college town I live in. I'm not very integrated into the scene but find it very hard to care... There is just this nagging feeling like I SHOULD care, since most people seem to be very caught up with image and "networking," wtf that means. I don't even have a facebook. Am I normal?