Imagine being on your deathbed, looking back at times like these. Imagine how silly you'll think it was that you were so nervous. New jobs, new relationships, new challenges -- these are good things in life.

Also, remember that your new colleagues are probably decent human beings. They'll be nice to you. Don't be afraid to ask them for help.

If they're jerks, then you don't want to work there anyway, start looking for a new job.