GS, I don't think I missed your point so much as I am perhaps a bit too quick to rise to the defense of the shy and socially backwards. While I stand by my point, I admit, upon reading your post again, that I read too much into it and over-personalized it.
Trembling did not raise a red flag for me as it is something that happens to me on occasion during stressful social situations. I still put myself in those situations because I don't want to allow my shyness to cause me to miss out on fun times.
I can imagine myself getting a case of the trembles under the circumstances mentioned above. Similar things have happened, but I try not to let it get in the way.
Still, the OP might want to consider if someone who is not as gregarious as they are is a good fit.