Hello,
Welcome to the ehealthforum and I am glad to help you out. Your concern is regarding the small pimples on your vagina. Well from your symptoms they looks more like irritated hair follicles or folliculitis or boils rather than herpes sores. Herpes presents as one or more blisters on or around the genitals or rectum. The blisters break, leaving tender ulcers (sores) that may take two to four weeks to heal the first time they occur.
I suggest you to get an evaluation done from a dermatologist and till that time, apply warm compresses on the bumps and keep the area clean. Topical antiseptic treatment and topical antibiotics such as mupirocin or neomycin containing ointment is very useful.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care.