ShyKiwi, YAY, you got a job!!

I remember how you wanted it and made so much effort to get it!!
Others are right, to just go and brave it... Remember, you may be nervous/excited inside, others may see a calm easygoing laid-back cool guy!!! (They can't read your mind!!)
When you're new, you're supposed to observe and learn, yup... And sometimes 'newbie questions' are okay and can help others see things differently too.. Just make sure to write things down so you don't need to ask the same things again and again..
Pre-Christmas time is nervous for a lot of people, for a lot of reasons.. Some of that may have nothing to do with your job... Just brave it, you don't have to like it!!
You can survive anything for three months! And once you make it past New Year's it's probably gonna be much easier!!
Think about how much better it will look on your resume if you have a few months there at least.. Puma almost didn't last the first week, and now it's more than a month!! (You might wanna read his thread.)
Maybe you can make sure to exercise to de-stress, take a walk, do something you like doing as reward..
And you can come back and report here later!! (in a vague and general enough way, so nobody gets recognized...)