Welcome to HCM,
You might be suffering with urinary tract infection
. You should drink plenty of water, give sample of urine in sterile container for routine examination and for Culture & Sensitivity to identify infecting organism and effective drugs. Meanwhile consult a doctor preferably Urologist
& start treatment to get symptomatic relief. As you are sexually active, you should avoid unprotected sex. Condom will prevent transmission of disease from sexual partner.
Wish you good health,