Vaginal discharge !! Help !!

Ok, so I had my first period when I was 12. But the night I had it I was to embarrassed & said nothing & put toilet paper so my clitoris became tender & sore . Then the next day I told my mom , but sense I did that my vagina became very itchy but still didn't say anything it was a constant every day itchy really bad . & a year later i started getting a white mucus & still never said nothing & jus left it as is . Until I was maybe 16 17 I said something so I went to the doctors & gave me a medicine that's called Luvena I think it was called & it was like a lotion type u had to squirt inside at night before u sleep becos it would drip out & I did that everyday but when it was to late I realized I was supposed to make a refill but never did . I was jus to embarrassed to tell my mom to make these actions , I kno it sound irresponsible. & then I turned 18 & I took myself to the Drs but she really didn't do or say anything or give me anything , she also did seem uninterested . I was told to maybe start wearing 100% cotton underwear I think ? & to use unsented things but it's so hard when I'm a female & use lotions & things like that . But til this day I'm going to be 20 in March & still have this discharge, it does have an odor & here & there it does itch . & at times it changes to like a clear liquid discharge or very thick or a thin white discharge . Also when I went the first time to get it checked out they did test me for stds but it was negative . Is there maybe anything I can do to stop this or would I need to make an appointment .