Pale yellow vaginal discharge and itching. vaginal culture test showed 8 white blood cells and no infection. what does this mean?

Infection?: Colored (e.g. yellow) vaginal discharge usually means infection. Speak to your doctor: exactly what infection tests were done? STDs like gonorrhea, chlamydia, trichomonas? (At your age, these are the most common causes.) Don't let this go: insist on further evaluation. If you think there is STD risk (e.g. you or partner have had other partners), your current sex partner also should be tested.