Is it bad if you don't get your period in so many months if you are 18 and you haven't had sex? i just got my pd after 10 months.

It is not normal: Hormonal imbalance can make your periods irregular. Stress or very vigorous excercise can reduce your periods. If you do not have an obvious reason to explain, you need to see a gynecologist. Sometimes it is due to low hormonal production...So you may need hormone supplements which can only be prescribed by a family doctor or a gynecologist.