Hi Albert,
It's normal to have the jitters prior to starting work, in fact,
it's pretty common. It's even worse if this is your very 1st job.
There's really Nothing much you can do about it, since you've
already signed on the dotted line. Why don't you take a deep
breath, grit your teeth, & simply face your 1st day?
For all you know, the people may be very nice, & you'll
actually be given many opportunities to learn. Have a positive
outlook 
If all else fails, buy some lavender oils. It's supposed to help
relax a person. I personally haven't tried it, but there're many
who swear by it.
FeowFeow
