Hello.
I bet it's way too long to ask this kind of thing, but would you tell me how I can say the following things more naturally?
Thank you in advance :)

Hi, everyone. How are you doing?
It's already December!
The streets are kind of in full Christmas mood, right?
In Japan, of course some people are Christians but most people just enjoy Christmas as a happy event.
If you're a kid, you'll enjoy having dinner and a Christmas cake with your family, and you'll get a Christmas gift from Santa, of course.
If you have a girlfriend or boyfriend, you'll go out on Christmas Eve or Christmas Day to see Christmas lights, hang out, give each other Christmas presents, or eat out.
It's said that Japanese Christmas for young adults is like the Valentine's Day in the west.
If you are single and don't have a relationship, you might part time work hard, or throwing a Christmas party with your friends who don't have a relationship as well.
If you are single and you don't have any event on that day, some young Japanese people call the situation クリぼっち/KURI-BOCCHI.
KURIBOCCHI means ”alone on Christmas".
クリぼっち/KURI-BOCCHI came from the two words "クリスマス/Christmas" and ”ひとりぼっち(Hitori-bocchi)/alone or lonely.
So, some young people don't want you to ask about what they're going to do on Christmas, but I'll show you some useful Japanese for Christmas.