Madness string 935

Random mermaid
Sun came out, and I walked on my feet and heard with my ears. I ate the bits, the bits stayed down, and I work. I function like I'm a girl. I hate it because I know it'll go away. The sun goes dark and chaos has come again. Bits. Fluids. What am I?!

Why do you worry about something that can kill you in ten years when there are so many things that can kill you right now?