In my non-art-educated opinion, you have enough really good pictures on your flikr site for a show. Maybe not everything there is at that level, but some of those photos are gorgeous. So I cast my vote along with the others. Keep your appointment. Now that you're so set up to be disappointed, there's really nothing bad that can happen. You either get some constructive criticism and a "come back later when your work is even better", or you get a pleasant surprise. Win win.
That said, we would like to know which win it turns out to be.
And btw, you should put some copy protection (virtual watermarks) on your photos on the web to keep people from downloading them as freebies, or (G_d forbid) passing them off as their own!