Welcome to HCM
Yeah you are true its not STD
. Green tea has also very least likely to be associated with such symptoms, in rare cases it causes increased urine output because it includes caffein which is a stimulant and may cause frequent micturition. The discomfort or burning you are having might be due to relative dehydration
which causes milder form of UTI. So best way is to increase water and fluid intake, it will go by itself.
Thanks, hope I solved your query.