Yes you can go. The issue is money and insurance. Do you have your own insurance card/do you have insurance - make sure you have access to all teh information any doctors office would need. The cost of hte actual appointment you'll have to find out about and find a source for the money.

Have you considered "faking sick" or.... saying you need to go to the doctor, or is your physical anytime soon? Your primary care doctor might be able to give you better references and advice, and it would seem "normal" to your parents.