Irregular periods, according to my doc i should have proper diet and exercise but that don't help. get periods 2/3 times a year. i'm 19 years old.

Need a hormone check: More history would be very helpful in making a diagnosis for you. For instance do you have hair growth in odd places for females, nipples, upper lip, chin? Are you overweight/have hard time losing weight? Gain weight in abdomen? Ever had cysts on your ovaries found? If yes get labs:full sex hormone panel, but concentrate on: total & free testosterone & total insulin. Could be pcos..