I have a hole above my vagina, but below my urethra

I wanted to examine myself down there, as I found out that it was very important to know more about your body. While I was looking in the mirror, I noticed I have a small hole above my vagina, an slightly below my urethra. I do not know what it is, and I did not think there should be any holes besides, your urethra, vagina, and anus. So now I am confused as to what it is, and I'm not sure how I long I've had it, as this is my first time actually spreading my labia and examining it full throttle so to speak. I'm not sexually active, and there are no signs of infection or anything like that, so I'm to assume I've had for a long time. I just don't know what it is. If you can explain it to me, or give me some advice on where to find that information, that would be great!