I need help

Ok so I’m just 15yrs old. I’ve had my period 3 or 4 times now. So I’m just getting used to it. Anyways I grabbed a mirror and looked down there cause I want to start using tampons (casue we live near beach) anyways I swear I couldn’t see my vagina. I know hat sounds stupid. And I’m sorry I’m new to this but there didn’t seem to be an actual hole to put something up. Pls help