Have found a bump above vagina near thigh. popped like a zit and had pus and blood. could it be herpes?

No: No. Most likely an infected hair follicle. These lesions are most common when women shave. Herpes is an ulcerated lesion that is quite painful.

Less likely: it is not likely to be herpes most likely it is a gland cyst or a hair root that trying to get infected. use a heat pad, avoid the temptation of squeezing it, clean with alcohol, and apply topical antibiotic. you are 20 years old, practice a safe sex ,this way you will never worry about STD including herpes. and remember there is some STD you are going to carry with you the rest of your life.