Ummm.mature women i need your help.! bad. i'm scared imight have an infection or something.?

Ok. Well I've been having these bumps come on my vagina. But I'm a virgin so I know it couldn't be a std. Anyways well the bumps are painful. But they only come one after the other. In other words once one is gone. Another comes along. I pop them and this yellowish puss comes out. Sometims its pink. Then they bleed after I've squeezed all the puss out. They are flesh colored and hurt when I touch them. And yes I masturbate so could these bumps come from masturbation.?? Also the bumps are located where the pubic hair is like on top. Nowhere near the lips or the inside. Plzz help. Is it serious because I'm really scared.