can't fit a tampon

Hoping someone can help me... I'm 17 and I'm a virgin, nothing's every been up there but when I've tried to put my finger up there it just won't go up and starts to hurt? Idk if I'm confused where my vagina actually is but idk.. also whenever I go to put a tamp on in I start to feel queasy which doesn't help. Do I maybe have a thick hymen or am I just confused where the opening is? My periods are normal btw