I started having pimple like bumps around the lips of my vagina and watery yellow discharge. my partner is std free & only person i've had sex with

Herpes?: This sounds like a newly acquired genital herpes infection. Genital herpes can occur in monogamous, apparently STD-free persons, sometimes HSV-1 from oral sex. See a doctor ASAP: accurate diagnosis of herpes is easier the earlier testing is done, and treatment is more effective the earlier it is started. Try to see someone today, even if it means a visit to an urgent care clinic. Good luck!