Some MEPS doctors may be old, but they are still doctors and they most certainly do look for outward and inward signs of STDs. Go to your local health clinic, some hospitals have them others are a separate area (use the phone book to find it). They will test you and medicate you for free, without telling your parents (if you are a minor). I would suggest, however that you do tell your parents, if it is something as serious as herpes, you will need some support. Do not shrug off HPV either, there is no cure and it is the fastest spreading STD out there ... there only one known protection against it, abstinence.
Do not sleep with anyone until you've seen a doctor and been diagnosed and cured (if possible). If it is Herpes or HPV, welcome to a world of pills, outbreaks and always having to inform everyone prior to sexual intercourse of your condition.
Get to the doctor, lad.