What is this white lump by my vagina?!?

I was in the shower the other day and noticed a bump near to my vagina opening, i decided to check it out with a miror, and didnt know what it was. Its blister looking, squidy and i havnt tried bursting it because its painful to the touch. It feels like its filled with puss or something. I am not sexually active. what could it be? And btw i hate doctors..