I haven't had my period for almost a year . i tried going to a couple of doctors but they don't seem to give me a 100 % answer is this serious ?

That : That is very abnormal. I am sorry you have not had success in seeking treatment. You need to see a board certified gynecologist and have a complete evaluation. Amenorrhea (absence of periods) can be caused by multiple issues, including hormonal issues, such as estrogen or thyroid, weight changes (either too high or too low), and a myriad of other causes. I am assuming you have had a pregnancy test that was negative; if not you need to have one immediately. Please seek out another opinion, i know it is frustrating but you are right, it could be a serious condition.