i agree with what they said.
go to the gyno and just say that you have itching down there, you don't have to say you are worried about an std if you are scared, the doc will swab stuff and find out what is wrong.
Go see a doc. Could be yeast, alergic reaction to condom, soap, detergent, could be an STD. You can't be diagnosed on the internet. If you don't treat things now, things could get worse.