i have like a lump inside my vagina

Right this is really embarressing for me, im 13 years old an recently last week i found there was a lump like inside my vagina but only on one side im reallly scared incase it is something really serious everytime like i touch it it's sore but then it's okay afterwards i don't know what to do an will it get in the way of sex an by the way i'm also a virgin so i don't know what this is an was wondering if any of yous could please tell me what this is or how i can get rid of it thank you.