The only way to be diagnosed is to be tested in a hospital, you can't just say "Oh, I pee a lot, I say I'm diabetic." It is certainly okay to *think* you're Diabetic, and it is okay to bring it up with your doctor if you think it's necessary. DO NOT self diagnose, that can be just as dangerous as not diagnosing at all. If you feel sick, or not like your normal self, see a doctor immediately, especially if you have family history of disease.