I've always heard that when someone is sensitive to cold temperatures, they are "cold-natured", meaning that is the nature of their body, or how they describe their physical well-being: colder than most people.
nature noun (CHARACTER)
The character of a person, or the characteristics a person is born with:
She’s always had a sunny nature.
She is by nature a gentle soul.
Q1: What is a cold-natured person?
A1: A cold-natured person is someone who more often feels cold than warm. Cold-natured people tend to be cold even when others around them are warm or when they experience higher temperatures.
A2: A 2004 study done by researchers at the University of Florida published in the Journal of Neuroscience provides evidence that some nerve cells react to things other than temperature when creating the sensation of being cold. Biochemicals, hormones and proteins in a cold-natured person's body play a role in determining a cold feeling despite outside temperatures feeling warm. This explains why factors such as depression or menopause sometimes play a role in a person being cold- or hot-natured.
Cold-blooded perhaps used to be the right word, but not anymore, thanks to the "slasher-movie" genre and endless news stories describing cold-blooded killings. And cold-hearted implies a cruel, or at least indifferent feeling toward others, not as evil-sounding as cold-blooded, but it's certainly no term anyone would want used to describe themselves.
"I have an aunt who is cold-natured. She is by no means cruel or indifferent, and certainly not evil. She's just cold -- especially in the wintertime."
Like-wise, if someone is able to withstand the cold better than most, such as wearing a t-shirt in cold weather, they are always called, "warm-natured", or "hot-natured".
I live in the eastern part of the U.S., and this expression is commonly used here to describe people who are more sensitive to heat or cold. Is this not a common expression everywhere? I hear it all the time.
Well, I hope this helps you make a decision on how to describe yourself. Good luck to you.
I've come to the conclusion long ago that our language is not written in stone, nor is it perfect by any means yet. Use it how you want to use it; the rest of the world will catch up.