If you want to look what’s hidden between your inner lips you need a mirror:
If you look at your vulva with a mirror you can easily spot the vaginal entrance if you tighten and then relax the muscles around the entrance. These are the same muscles that control the urine flow. Try to find them while you’re peeing: stop the flow and notice which muscles flex.
Around the vaginal opening there can be a small piece of tissue. This is called the hymen. Some assume the hymen is a membrane that covers the whole entrance, but that’s not the case. The shape of this small piece of tissue can change. Some of this occurs naturally during the first years of life, but this can also happen later with tampon use, masturbation, intercourse or the birth of a child.