There are a few different types of schizophrenia and what this means is that not everyone feels or experiences the same thing. A schizophrenic is not equal to any other person with schizophrenia. There are really about four main types.
One type of schizophrenia is catatonic schizophrenia which is the type where a person might just sit there all day and not do anything. They might just stare at a wall and drool everywhere. That sounds mean but really, that's what it is like. They may not have any emotions, and they might just do the same movement over and over again like bouncing their leg. This can go on for days and days and when anyone tries to move them, they can seem like they are solid rock and super human in strength.
Paranoid schizophrenia is the kind where there are a lot of hallucinations and delusions and paranoid thinking. This is the kind John Nash had, where he thought the government was hiding in the bushes all of the time and stuff.
There is the kind of schizophrenia called Disorganized schizophrenia that makes it really hard to think and communicate good. People have a hard time using whole sentences or making sense to anyone else. They might say something like “Hello, I am a peanut with laser beam shadows against floor faucet dripping.” Haha, I made that up, but I think you know what I mean!
Then there is a type called undifferentiated which means it's a mixture of two or more types.