Don't feel that you're somehow unworthy. You have wonderful people skills. I'm sure they'll be lucky to have you. You must be a joy to be around if you're anything like the person you play here. ;-D
Remember that companies need good people as much as you need a good job. You're offering value to them too. Once you've got a few paychecks in your pocket I'm sure your worries about being "good enough" will fade away.
You'll do great. Keep a few clean jokes handy to break the ice and best of luck!
Cheers,
Scott.
(Who wishes more of the service people he deals with were worried about measuring up! :-)