What Causes Bumps In Vagina?

Hi, i am 17 years old and sexually active but i don't have sex a lot. recently i found when i open my labia minora that it's small bumps everywhere on the left and right side. i asked my sex partner was he clean from all std's and he said yes, he had got tested before he had his son. the bumps are kind of raised and when i touch them there kind of short strings. i have no idea what this could be bu I'm going to the doctor Monday. No std's seem to match up with what i have. What could it be ?