Fingering- confused

Hey so I’m 17 but I haven’t really explored my body much and quite frankly I don’t really know how everything’s is meant to work down there 👇

I put my fingers inside, and I come across this big hard ball thing eventually and I have no clue what it is, it's only about 2 inches in, are you just meant to squeeze your way past it? Is it even normal?

What I’m trying to say is... what even is the inside of your vagina like?

How are you meant to finger yourself so it even feels good? (It barely feels good and I have never orgasmed- it’s like I just kinda say “oh well thats enough” as soon as I think I’m getting close)