I read that i can visit a gynecologist without my parents knowing(ima minor), but what if i turned out to have an infection or somethg,will they tell my parents?i want to see a doctor,but myparents cant know,and im scarredto leave anything untreated?

At 18, you are an adult and can seek medical attention. However, if you are still on your parents insurance, your claim will be returned to them. If you believe you are unwell, it is important to seek medical attention. Your parents I am sure would prefer you get proper medical care. Certainly gyn infections, possible pregnancy or other gyn symptoms should prompt immediate care.