Don't know my hymen

Silveria
Hey guys I really need help. I just started doing stuff with my boyfriend and it's my first kiss my first everything but we haven't had sex yet! He's been putting his finger in me recently (just one) and I'm confused so I came here for answers. I was surprised when his whole finger got in and I didn't even feel it, he had to tell me that he slid his finger in so I got really confused cuz I didn't bleed. I want to know where the hymen is located and how deep it is. I tried searching on Google but I didn't get the answers I needed and all the diagrams of the hymen were outside the vagina but they kept explaining your hymen is inside your vagina. Also I tried checking for my vaginal hole through the mirror and I couldn't see it. There was this fleshy lump covering the hole and I don't know what that is, can you tell me? I've tried wearing a tampon but couldn't get it in.