How do i for sure know if i have a uti?

Urinalysis: You may be having symptoms like urinary frequency, burning, and feeling like you can't quite finish -- and these would be hints. But you need a urinalysis to know for sure -- even better with urine culture and sensitivity. Urine should normally be sterile. If chronic it could be another kind of bladder problem. See your doctor.

Thanks for asking!: The definetive test for diagnosis of urinary infection is urine culture and senstevity.