This happened a few years ago, but it still traumatizes me this day because of how graphic it was. (T.W. rape)
I woke up in a huge empty place with two huge storm drains side by side of each other.

I was in one of the storm drains, while a woman I didn't know was in the other storm drain. Suddenly, a big voice echoed and explained that we had been kidnapped for an experiment. The voice said that I would have to try to escape while the other woman has to fight.
I didn't know what it meant at the time, but we both were scared out of our minds. A loud buzzer sound could be heard, and with that, about 4 big figures were onto the girl in a matter of mere moments. They all had pig faces, but they weren't masks. She was screaming and they were laughing as they violated her. My job was to run away in order to save her. The concept was that she would get raped over and over until I found a way to escape while some monster chased me. I ran as fast as I could, panicking and trying to hurry as those screams echoed in such a big place.

The monster was a huge worm creature that would crawl as fast as I could run, faster even. And each time it killed me, the day repeated itself and the woman and I would do it all over again. This happened until I finally woke up.
_______________
Now, I've had a lot of dreams revolving around the most disturbing topics anyone could think of. (Gore, rape, cannibalism just to name a few.) But this dream really was so vivid that I was scared and stayed up for two days straight because I didn't want to dream about this again.
Girl how much hanime And horror have you been watching?
LMAOOOO
I do like the horror genre a lot though
Tbh I just think you're reading/watching to much smut/porn and horror or it could have to do with a Traumatic event that happened when you were younger that you tried to forget because it was so traumatic but now you're brain is trying to make you remember what happened with this weird ass dream but let's just hope it's the first option
Hopefully
Your unconscious mind keep trauma memories. That could be issues like: fear, survival mode (fight response to trauma), low self estemn (fawn response) stored in the past.
You, the poor girl and even the monsters are only ONE. It just represents different sides in your personality. Keep up with the dream journal for more information and break the trauma cycle in your unconscious mind. That is the message of this dream. No need to worry.
Still scary as shit though