Hi, and thanks for your medical question on eHealth forum!
Pain in the lower abdomen and/or pelvis, and vagina can be due to infection, pelvic inflammatory disease, UTI, STD, uterine fibroids, urinary bladder infection or cystitis. If you do not have any discharge and there is no other symptom then it can also be due to pinched nerve (either pudendal or spinal). These conditions are broadly classified as chronic pelvic pain syndrome. The intensity of pain depends on the degree of inflammation and thus compression. This can vary.
Since a confirmed diagnosis cannot be given on net please consult your gynecologist regarding this. Hope this helps. Take care!