31y.O. Woman. Suddenly having trouble urinating. Can only relieve bladder when full. Takes a long time and concentration. Not a uti. No pain.

Anatomy. Something is wrong. Something is interfering with the normal function of your bladder and urethra. One common scenario would be a bladder or uterine prolapse which is chaining your anatomy. I think this needs a full examination and testing at the gynecologist's office.