Chances for you to match into urology as an IMG are almost zero. I have never met an IMG urology resident. The reason is because there are very few spots, and it is a very, very popular field among US medical students right now. Even the majority of US medical students with good USMLE scores cannot get into urology because it is so ultracompetitive. I went to a medical school ranked in the top 10 in the US and we had several people who wanted to do things like urology and plastic surgery and dermatology who just couldn't do it because they could get in - all had good USMLE scores as well. You basically have to have a perfect application to get one of those - great letters of recommendation, high USMLE Scores, probably some research and almost have to go to a US school.
You may need to decide on your priorities. Is it more important to train in the US or is it more important to you to be a urologist? If the former, then go for something like IM, family practice, physicial med/rehab, psychiatry, or perhaps general surgery if you really want to do something surgical. If it is the latter, you may need to stay in your country to train as a urologist, or explore other countries (? Australia) though I have no idea how competitive urology would be there.