Weird Vagina Thing

So, I’m 21 and have yet to see a gyno (working on it). I have normal periods and have had many orgasms in my life. However as I’ve gotten older I’ve noticed there’s something odd about my vagina. It’s very very shallow, and almost like something is blocking it? I can feel my hymen, and there’s something else directly behind it that I can push on, but it kind of hurts to do so.

I’ve never used tampons for that reason. Anyone heard of anything like this? Hoping I could get some answers before my appointment, it’s always been an odd thing for me.