You're definitely not the only one! I'm also excited for Christmas early and typically am. I think I'm excited for it year-round.
There's no particular reason, more like a combo of things, and it definitely doesn't have to do with presents. I love the feeling I get around Christmastime...that homey, cozy, warm feeling. The smells are also amazing, a combination of good food, baked goods, the Christmas tree, and the air outside. I also love the fact that the radio station that I love listening to plays Christmas music 24/7 all through December.
I love being with family and friends. Speaking of friends, my friends and I used to go caroling together. We did it every year in high school and through a bit of college too, and although most of us have gone our separate ways for college and all, there's still those memories.
I was also born at around Christmastime too, so there's that aspect. I could go on and on about Christmas! XD