Hi Alice,
So, the first thing to know is that the hymen that most people are taught about isn't a thing that exists. Instead there's something called the vaginal corona. You can read about the corona in detail here:
My Corona: The Anatomy Formerly Known as the Hymen & the Myths That Surround It . The corona is generally, "1–2 centimeters just inside the vaginal opening, not deep inside the vagina. Every corona looks different – just like ear lobes, noses and labia – and differs in size, color and shape. It consists of thin folds of mucous tissue, which may be tightly or more loosely folded. It is slightly pink, almost transparent, but if it’s thicker it may look a little paler or whitish. It may resemble the petals of a rose or other flower, it may be carnation-shaped, or it may look like a jigsaw piece or a half-moon. In the vast majority of cases, it is elastic and stretchy.
Sometimes, albeit very rarely, the mucous tissue folds may cover the entire vaginal opening. In this case, you may need to see a gynecologist and have the vaginal corona opened to release menstrual blood and enable you to insert a tampon or have intercourse or other insertive sex." Does that description sort of match what you're seeing or feeling when you insert your fingers?