how come my teeth hurt and ache when they come in contact with the cold
I have the same problem, so my dentist recommended a sensitivity toothpaste which can be found anywhere . Any brand will do. It has worked great for me.
It's your body's way of reacting to the colder environment...
You probably have a thinner enamel
Some people are like that, and I am one of them too :) I guess its cuz there are different types of teeth, some are stronger than others.