I should think these "shakes" are a mixture of nervous tension, fear of pain, muscle strain and unresolved sexual energy.....
.....I'm not sure who you wanted your message to appear to others but for me it comes over as almost unbearably sad and utterly dreadful!.....it sounds, in fact, medieval,.....quite lterally from a bye-gone age. It sounds as if you had to lie there and 'think of England' while you were 'deflowered' by an ignorant and brutal husband...
Why were you "cold"?...did you have to 'do it' outside for some reason?
Sex is a sensual communication between people,..it's not about achieving full penetration, which is but one small part of the whole thing.
'Tarpy' will be here before long and she will say that she never believes in virginal wedding nights, and she will be right!....this whole sorry business could have been avoided with some forethought and sensible planning. I'm a man and I have been involved in removing a virginity or three, but I'm very glad to say that none of my experience was this awful!