If you were both virgins, it is impossible for you to have contracted an STD. Since STDs are only contracted through sexual contact, one of you would have had to have had sex before with an infected partner.

Get it checked out anyway, though. If something is wrong, you can get it fixed, and if not you can put your mind at ease.

Remember, it is always better to be safe than to wind up sorry later. So it's a good thing you are concerned about it, even if it is not Herpes.