What are sores on the vagina signs of if you're still a virgin?

Possibly herpes. Genital sores in a virgin could indicate that she had her boyfriend perform oral sex on her. If he carries the herpes simplex virus 1, which typically causes cold sores, he could have infected her with the virus. While it used to be HSV-2 that caused genital herpes, HSV-1 is more frequently seen now as the cause for genital herpes. A blood test will reveal the diagnosis. Or it's from shaving.
See your GYN. There are several possible types of sores. You have not given enough information for any other advise. See the DR soon. If they heal before you are seen the diagnosis may be left to speculation. They may be trivial but it is important to define the nature of them.