Hey, women get fearful of men. There's nothing wrong with a man getting fearful of a woman not being able to do personal examinations correctly, especially since you are of the opposite sex. There are a lot of doctors out there that suck, though. So, if you do feel a lump on your testicles, I encourage you to get a second opinion if she ends up being one that is horrible.
That being said, while doctors are never always right, it is important to consider limitations in what you may or may not know about medical diseases. For example, many people might want a test ordered that makes absolutely no sense medically. It helps to find a doctor that explains why it would or wouldn't be relevant, so you can understand your options. If you were talking about sticking up in front of Psychiatrists, though, your experiences and feelings are usually more relevant than theirs.