I Am 17 Years Old And I Havent Had Sex

I am 17 years old and i havent had sex in about 3 1/2 months. Sometimes after i shave my vagina,ill get cuts or random pimples. I had gotta a pimple on my vagina lip. It popped and its been a month and hasnt went away. Its somewhat hard when i push on it and painful to touch. Last night i squeezed it and blood an some puss came out. The size went down a little. Should i be concerned?