When i go to my doctor and tell him i urinate a lot, will he be able to determine if i'm diabetic or not?

Diabetic: At your age you are likely to have type 2 diabetes if anything. In that case you are not diabetic - you would have diabetes and work hard to get rid of it. Yes your doctor will be able to determine if you have diabetes or not. Tell her/him all your symptoms. You will then be examined and appropriate labs drawn. When the results come in management will start if needed.