An 17-year-old female presents with the chief complaint of never having had a menstrual period and no breast development. She is of normal stature and has no dysmorphic features. Her karyotype is 46,XX. Laboratory investigations reveal markedly elevated follicle-stimulating hormone (FSH) and luteinizing hormone (LH) levels. A pelvic ultrasound shows a normal uterus but only streak ovaries. What is the most likely diagnosis?