A 14-year-old girl has been delivered to a gynecological department with complaints of profuse blood discharge from her genital tract for 2 weeks. Anamnesis: menstruation since 13, irregular, painful, profuse; the last one was 2 months ago. Objectively: pale skin and mucosa, BP- 100/60 mm Hg, Hb-108 g/l. The abdomen is soft and painless on palpation. Rectal examination revealed no pathologies of reproductive organs. What condition is it?