What is wrong with my privates?

I'm 19F, a virgin and I've never experimented down there. The reason is, I can't, cause nothing fits in there. Until like a year ago, i didn't even know where my vaginal opening was. Apart from me being completely uneducated at this, the diagrams i looked at didn't look like mine. The hole is completely not visible. I even thought i had no hole but period blood has to come out of somewhere right? Anyways, at some point i did find the hole, but its so tiny i can only slide half my pinky finger in and it's painful. When you look at diagrams, it says inner lips, urethra, vaginal opening. In mine, (what i assume is) the urethra, is where the vaginal opening is supposed to be, leaving the hole like i said completely not visible just at the very bottom. I thought the diagrams where just exaggerated so i looked at pictures and they didn't look like mine either. How am i supposed to have sex or do anything else when i cant even get my pinky in? Is anyone else's like that? Do i have some kind of abnormality? Or am i tripping and it's so small cause nothings ever been in it?