The size of your erection is not a problem. Of course, there are many variables between a man and a woman, so that one cannot account for every unique situation. It is said that the most important sex organ is the one located between the ears. Size does not matter, but YOU need confidence that size does not really matter. If one looks at the mechanics involved, you really only need 2 inches in almost all situations. One nice thing is that a woman could get your entire organ into her mouth during oral sex, for instance. But concerning your anxiety, you will want to conduct yourself as if size does not matter, so that you will not short-circuit any sexual responses caused by doubt which most men have from time to time. Of course, if she reacts negatively, then that is her problem. Move on and continue to look for Ms. Right. She is out there. Continue to work with your urologist.
1. this is not a Dr's site
2. no one can tell you what size is right. it's different for every person.
You need to see a therapist.