im 16 and i have my period for a few years now and its VERY VERY VERY irregular. i didnt have my period for several months and now i have them way to long sometimes theyre light sometimes its heavy whats wrong with me? could it be stress i moved to the states about a year ago from germany i dont have friends my family isnt really there for me and im really overweight so can someone please tell me whats wrong im really worried.