Bumps on vagina

I am 19 years old and I have been sexually active with my boyfriend for about seven months.  He was a virgin, but I was not... recently I have discovered that I have tiny bumps on the inside of my vagina lips. I scratch them causes them to get a little bit bigger.  I have some small bumps on top of my vagina lip (left one).  It is the same color as my skin, it is not red like I keep reading about other girls.  I am afraid! I have not had sex with anyone else for a while, and my boyfriend has only been with me. I know that for a fact. What is it?!?