D.B.
I'm glad you felt you could come to a group of moms for advice. Even though you have dealt with this pain for a long time and haven't discussed it with anyone, you've taken a step in the right direction by reaching out to take responsibility for your own health. And if you're using terms like "mons pubis," then you've done some research or reading about women's health. If you have the opportunity, go to a large or medium library and get a copy of "Our Bodies, Ourselves" which has been the mainstay of open discussions and explanations of teen and women's health for decades. It's been updated many times. You can read the book privately in the library, or you can take it out (library cards are free) and, once you return it, the record of you having checked it out is wiped out. Just in case you're worried about that.
First of all, try really hard not to be scared. Most of the time, these odd pains and problems are very fixable and not anything extremely serious. So don't be afraid of the results you might learn. And don't try to diagnosis this yourself - you'll wind up wasting time and getting too upset about what you find on the internet. "Dr. Google" is rarely a person's friend!
Next, find someone you can talk to. As others have suggested, that might be:
1) your parents, or perhaps just one of them. For most teen girls, their mother is easier to approach than their father, but not always. You can say you have pain in the genital area, or even the area around your urinary tract if you don't want to be too specific. Get an appointment with your doctor.
2) Talk to your doctor, whether it's a pediatrician or an internal medicine doctor (for most teens up to 18 and even through college, the pediatrician remains the primary care doctor). Ask to go in the exam room alone with the doctor without your mother - that's routine at this age. No matter how embarrassed you may feel, your doctor has talked to dozens of teens about things like this, and many more embarrassing than this. The doctor is a professional and should be objective. This visit should be covered by your health insurance, perhaps with a small copay, which I am sure your parents will be willing to pay.
3) If your doctor is a man and that makes you uncomfortable, call the office number and ask for a callback from the nurse (request a woman nurse if that's better for you). Or, when you go into the office, talk to the nurse first (usually that's who you see first anyway), and you can ask that nurse to stay with you in the exam room when the doctor comes in. If you have to, talk again to the nurse and just let the doctor listen in. Sometimes that's easier.
4) Go to a women's clinic like Planned Parenthood. Make sure it's really a clinic and don't fall for similar sounding names like "Problem Pregnancy." A lot of fake centers pop up to oppose teen sex and abortion, and many don't have doctors on staff, just "counselors" with few credentials and a specific agenda. (I know you're not pregnant but you don't have to be to go to a women's health center). Only go here if you really cannot talk to your parents or your regular doctor. If you don't want to use your insurance, ask about a sliding scale fee or a payment plan.
Write everything down that you can think of about this history so that, when you talk in person or by phone, you have the basic info, chronology and so forth (including the pain on a scale of 1-10, with 1 being minor and 10 being excruciating). It's so very easy to forget things at an appointment, and the majority of people (adults included) take a checklist with them when they are seen.