At your age about 1/3 of folks have hsv1 orally. if you want to know if you have it, get tested. same goes with hsv2 from your encounters.
grace
Around 1/4 of the population has herpes 2, but only 1 out of 10 infected people know it. So, it is very possible to have herpes without symptoms. On the other hand, if you don't know that this girl is infected then the chances for a single encounter would be very low. The risk of infection increases with frequency of sex.