I have celiac disease a year ago is when i started having symptoms. is it normal to not have symptoms your whole life then all the sudden have them?

Yes: This is actually a common occurrence. Else all of us would live forever. Sometimes a disease process has started much earlier (think coronary disease) but causes no symptoms until a clinical point has reached.

Very much so: Think of a domino effect, where one falls on another in sequence until they all fall. You can have a genetic predisposition to celiac but never develop it or have a triggering event that starts the process at any age. For some reason your body started developing antibodies to some of the proteins in wheat & these get confused & attack your intestinal tissues. It really doesn't hide once it starts.