Dont sweat the small stuff hun

Like Roadie and DH said, grab your costume and assume a role. Thats the best way to get thru any job. You dont have to command any alpha what what in a company. See someone you recognize or take a liking to? Have a few words with them, so they know you're approachable. Yes, 'quiet' does get horribly misread, thats why I said that... Oh, and if it helps any, write 'social' into the character you'll play at work. And if social is too 'big' for now, add 'friendly'