hey there, ummm, just wanted to reply, my cousin, he has that, except his hands are sweaty and cold all the time, it doesnt really bother me to shake his hand, we joke about it sometimes, "sweaty palm syndrome".. anyway, sometimes people ask why his hand is cold, but its just out of curiosity, not because they think hes weird.. so youll be fine, and yes you are a mammal, some people just have cold hands, its not your fault its that way.. hope i was some help