You do REALLY need to get tested ASAP.
The issue is, you could be spreading it to others via toilet seats, anything you sit on that comes into contact with that area. Not only spreading the disease or condition, but the condition itself will worsen.
SO PLEASE GO GET TREATED.
There is a health department in your state that is WILLING to give you free/reduced attention. I have had many acquaintances go get plan B and tested, for FREE. They will also direct you to the correct divisions for medical attention, if it may be a situation they cannot handle.