There are some clinics available in which does not need parental consent. However, it depends on the state in which you live in and their policy.
If you have had unprotected inertive vaginal/anal sex then, (and with your symptoms) get tested for bacterial STDs. To your finacial question, I recommoned seeing someone who deals with STD (planned parenhood). Everyone smells when they exercise. You are old enough in most places to go without your parents, if not ask an older friend to take you.