Question about inside the vagina

I still have tons of questions about my reproductive system. I've been teaching myself via Google and this app but there's one question that I can never find the answer to.

What is the thing that I can feel if I stick my finger inside my vagina? It's shaped kind of like a pointy tongue and it's really soft but I can't reach it completely.

And while I'm asking, how many pathways are inside the vagina? Looking at diagrams makes me think it's a straight tube, but if I stick my finger inside, there's about three different directions i could go... what is this?

I've tried googling everything from g-spot to cervix to anterior vaginal wall and I don't have a clue. Help?