kmutay, Your hymen is right at the entrance to your vagina. When you developed in your mother's womb, your hymen sealed off your insides to prevent fluid from entering your developing body.
If you pull your inner lips open, you should see your hymen in the vaginal entrance without having to pull anything else open.
What happens if you stick your finger into your vagina? How deep can it go? Do you feel your cervix (feels like the tip of your nose with a little dimple in the middle at the top of your vagina)?
Don't be afraid to explore and figure out what is going on. As long as your hands are clean, you cannot do any harm. Take a mirror and look.
Take care.