Unless you have a family history of Schizophrenia I would not worry about it.
If you are Schizophrenic you would get some symptoms of it while you are sober and not just high. That's what happened to a friend of mine who's Schizophrenic. He smoked pot but got the signs and symptoms of Schizophrenia not from smoking pot but because he is Schizophrenic.
If you are that worried about it I'd talk to a therapist just to have peace of mind.
I've actually talked to psychologists about the so called "link" between smoking herb and Schizophrenia that you see in the media from anti-drug non-profit orgs that want to spread false information, and they told me how unless you are Schizophrenic or have a genetic family history of Schizophrenia you're not going to somehow become Schizophrenic out of nowhere from smoking herb.
What exactly happens when you're high? Keep in mind that some people do get socially withdrawn, anxious, paranoid, or have panic/anxiety attacks when they get too high.