A little bit of psychology insight helps as does self confidence. Smile, look as though you are a pleasant person. When approaching someone, smile and say Hi.
Introduce yourself to co-workers including the ancillary staff. I know you are so self conscious and overwhelmed that the frown on your face really isn't you but.........that is the you everyone else is seeing.
Don't be afraid to ask for assistance in finding things or asking about policy. Thank people for their help and don't apologize for not knowing something...focus on the nice person who helped you instead and they will be willing to help again in the near future.
Identify your resource person/people, the Charge nurse and secretary are two vital information sources.
Take notes, keep a small spiral notebook in your pocket; some things to write down so you are not overwhelmed with information are Pagers for ancillary departments, phone extensions, computer sign on and door lock codes, name of your preceptor, unit managers number, call off number and any changes in your schedule.
Be honest with your preceptor on what "you feel you still need to become productive on this unit". Have daily "huddle sessions" with your preceptor on how you feel you are doing and what you feel you need to improve on.
Listen and take notes when your preceptor seems to be telling you things you were not really aware of. Sometimes we become too intense on one issue and don't see the whole picture. Review those notes later during a break or after work.
Remember we can all learn something from everyone, when we feel we know it all we become lax and dangerous as nurses.
Welcome to your new job!!!!!!!!