Why am I always cold, even when I layer up?

I think there's something wrong with my body temperature. I'm always physically cold. My coworkers will walk into the office and say it's boiling l but I'm freezing cold. I feel like I always need a sweater, even at the slightest breeze. I'm wearing a light jacket and a fleece sweater over it now but still feel chills. I don't feel I'll or anything. Sometimes it feels like the coldness is inside of me (wow does that sound emo or what). What's wrong with me?!