Hello and welcome to HCM.
Thank you for your query.
In my opinion, this sounds more like a
urinary tract infection (UTI), but of course this will have to be confirmed. No doctor should assume a diagnosis, without being conpletely sure about the clinical presentation and have laboratory reports to back his diagnosis.
In your case, your doctor has assumed such a scenario due to your age, and I suppose because you must be sexually active.
I would advise a urine analysis, which will very clearly help in finding the infection, which is the most likely cause.
Once the infection has been diagnosed, treatment will include antibiotic coverage specific to the kind of infection you have, pain management medication (if you are experiencing any pain; and a urine alkalizer which will help relieve you of your symptoms.
In the meantime, please abstain from all forms of sexual contact as this can aggravate your infection (if you are sexually active) and drink plenty of water to keep yourself hydrated.
I hope I have succeeded in providing the information you were looking for. Please feel free to write back to me for any further clarifications at: http://doctor.healthcaremagic.com/doctors/dr-shoaib-khan/64581 . I would gladly help you.
Best wishes.