I can’t finger myself

hi!! I'm not sure where else to post this so I'm just asking it here. I'm female .when I'm masturbating I usually rub my clit(tried pillow grinding but it hurt) and I cum but I really wanna try fingering myself, I'm a total virgin btw bht when I yried inserting only maybr a half of my middle finger i can't go any deeper and something kinda feels hard? I can't explain it but I just can't go any farther and it's kinda frustrating! Hopefully this makes sense I'm so confused.