Once psychosis come it comes hard , usually. So you will know it, (impossible to hold a job and coexist in social settings are examples) and the people around you will know it (they may ask you to go to a doctor, or even possibly escort you to hospital).

Schizophrenia is just one outcome (1% of the population), some people (most!) will not get that far , maybe they have protective biological qualities or better coping mechanisms. BUT..could go on to develop general anxiety disorder , or OCD or bipolar without psychotic features.

OR they could just grow out of it , just a phase..