It may just be anxiety, are you nervous or anything. You don't sound old enough for OAB, and doesn't sound like urinary or kdney problem, may be anxiety.
It sounds like some sort of OCD to me. Therapy may be what you need.
I've had countless trips to the doctors and done pee tests and theres no infection in the urine..???
Sounds like you may have overactive bladder or an infection. Talk to your Dr. =)