What Could Sore Nipples,painful Urination And Bumps On Vagina Suggest?

hello doctors I am a 15 year old female and I have had sex a couple times, but like the last time I had sex it felt so good and right until like a couple months later I start experiencing a little burning when I urinate, scars on my nipples that itch and burn when I bathe, bumps on my vaginal area that dont hurt but they sort of bust out like a pimple because pus comes out and then it bleeds a little bit and it itchs real bad like around my lips and on my vagina lips and I just want to know what could it be?