Should I Be This Nervous Before A Show?

What a lovely venue St. Lawrence's Art Centre is.
After a nervy morning, we left rather late and I was the last one to set up my work (t'was ever thus..)
I get SO worried before putting my work up - and it's difficult to sort out exactly why - as even thinking about trying to assess it all seems so emotive.
But this is something I really have to address as it almost ruins the experience every time for me!

I wonder if I am on my own or if there are many peeps out there who get nerves like me...?
it's almost a kind of 'stage fright' I suppose - and yet it has also stopped me from selling online so far.
I joined Etsy in 2008 and had a shop set up since 2011, but it sits empty!
How silly is that?
OR
How lazy?
OR
How chicken is that?
OR
How techno shy? Or what...?

All of that continues in my head and there are butterflies in my tummy - yet I'm there and it's the preview - with over seventy people looking, chatting, milling about. The whole space looks great, my work is out, it looks fine - lovely people come along and say complimentary things about it - and I smile - and - and I should be talking to everyone.
The other artists seem to make it look easy - working the room; 'networking' -
I just feel awkward and self-conscious...
How do I start? What do I say?
Smile, open mouth; words will come out:

"Hello there..." 

Once I get that far, it's a bit easier and things to say start to come into my head, finding their way to my mouth and I say stuff, ask people questions.
It's funny because I can normally talk for the Northern hemisphere...but put me in front of my work, tell me to sell it and I'll freeze.
Am I the only one, or does everyone find it hard?
Is it too personal? - I'll sell your work for you, if you'll sell mine - that could be a way round it...

 

I'm OK with eye contact though...

Next time I'll tell you how I felt after three days of exhibiting my work - did I hide up; serve teas and wash up away from my work?