Dreams.

I had a rather strange dream today...
Again, I'm at school, lots of familiar faces, again I'm going to my class (and everyone was arranged exactly as in reality, some were talking in the hallway with random people, some were sitting in the classroom, some were drinking coffee), I go in and sit down, then a girl (from a completely different class) comes up to me and sits on my lap... in the dream, she's like my girlfriend O_o, but in reality, we practically never talked, just a hello and goodbye, nothing more. Well, anyway, we're talking, and then she turns into a cat O_____O, not even a cat, but a kitten, but not a small one, more like a teenager. Strangely, this didn't shock or surprise me in the dream; I got up and left the classroom. When I was walking around the school, everyone was looking at me like I was an idiot, as if, why did I bring a cat to school. I go back, and while I was gone, my friend and my former classmate came to the class. I don't remember if she liked cats in reality, but she offered to buy the cat from me and asked how much I wanted for it. Without hesitation, I agreed and named a price of 20 UAH (about 100 rubles). She asked why so little, and I said 40 UAH instead. She gave me the money, took the cat, and left. The strangest thing is that she gave me 40 UAH with a 20 UAH bill, and the rest with bills of 8 UAH, but that denomination doesn't even exist O_o
It was a very strange and incredibly realistic dream; usually, everything is kind of blurry in dreams, but I saw the faces of all the familiar people so clearly, as if it were really reality, and I also remember the cat well; it was ash-colored and looked like a British Shorthair breed...
This dream scares me; I wish I knew what it means