I'm a thal minor, but my temperature is also always slightly higher. Am always warm and every one who hugs me always asks if i have a fever.
I am prone to mild infections - i feel i have one or the other all the time, even though I am not always aware of it.
Another reason could be the high metabolic rate, if i lie still in bed for few days without much activity, i feel cooler. But the usual days of activities, i feel I burn up fast. The more tired I am, the warmer I feel. To a limit, of course, after which i have to take rest or I will pass out. :-)
Try measuring your temperature, after a long period of total rest.
:-)