Open Question: Why do it always seem to be cold?

When I'm in a room with the AC on and all, I still seem to feel cold.. Noone else feels this cold but me.....what could cause this.... Now I always wear my coat..(it's summer time)lol but my parent keep telling me I should take the coat off or my body will adjust to always wearing it...it's not healthy... What is causing this?? What do I do to fix it??? Any help please....