Never started menstrual cycle, my age is 27 f. pelvic scan shows small uterus.no breast devolopment.vegainal passage consticted.low amount of pubic hai?

See a doctor: It sounds as if you have already seen a doctor if you had a pelvic ultrasound. If you never had a menstrual cycle and you don't have breast development, there could be more serious congenital malformation. Most concerning would be increase risk for tumors and lack of estrogen to protect your bones. Definitely see a doctor, you may need a karyotype, test for problem with pituitary, and bone scan.