Hi! I m an 18 year old girl, and I ve had my period for 5 years. My periods were always irregular, but I never went more than 3 months without a period. My last two cycles however, have lasted almost 300 days each, meaning that I ve only had one period in the last year. I m not sexually active, so I m not pregnant, I haven t been under unusual stress, and I don t think I m an abnormal weight (5 3 , 102 lbs). Why is this happening and what can I do to fix it? I ve heard it s unhealthy to go without a period.