Your symptoms of itching and thick white discharge suggest a common vaginal yeast infection, typically treated with antifungal medications like fluconazole or clotrimazole. However, because you also experience lower abdominal pain and are sexually active, it is very important to see a doctor rather than self-treating. Abdominal pain can sometimes indicate pelvic inflammatory disease (PID) or a sexually transmitted infection, which requires specific prescription antibiotics like doxycycline or metronidazole. Please visit a healthcare provider for a simple swab test. Rest assured, these conditions are very common, easy to diagnose, and highly treatable with the correct prescription.