Can you tell me if I go to the doctor stressing about my mental health, will they tell my parents?

Privacy Laws. As an adult, the information you discuss with your doctor is confidential. The doctor must get your consent to talk with family. See this link if you need to know more specifics about the privacy laws: http://www.Hhs.Gov/ocr/privacy/hipaa/understanding/summary/.
Not with privacy. Laws. If you are 45 years old as you state why would they tell your parents, .