I am also 22 years old and I have been having the same problem. It started to occur to my belief after I had been having an increased amount of sex that I was usually used to while seeing two different girls. I know both of the girls do not have any STDs so I am confused as to what this could be. I too thought that it might be a yeast infection so I have made a doctors appointment. I don't believe that I have chlamydia given the status of the two other girls who have not been sleeping with other people (trust me I know). Maybe from jerking off too much too in addition to sex? Looking for potential answers and if your guys' problem became any better.
I've had the same problem for the same length of time. The girl I was seeing went to the dr and said everything was fine. Not having Insurance, the dr treated my symptoms with antibiotics for clamydia/gonnorea, seemed to help, but still have a very slight discharge that I actually have to probe in order to find. I'm looking to go to the dr again and get tested for STDs, though I'm pretty sure it's not that. I'm 40 and under an extreme amount of stress due to job loss, which may create other urinary issues for men my age. Otherwise I'm in great shape.
Please let me know how you make out, I'll do like wise