These ideas are not based on fact. It is called social stigma . Stigma often makes the mentally ill person feel afraid or ashamed. Mental illness may be due to psychiatric disorders such as schizophrenia or major depression. Difficulties in life also may contribute to the development of mental illness.
Mental illness resulst from changes in the brain.
These changes alter the way you think and feel. You may no longer enjoy things that used to be fun. Social activities take too much effort. Everything you do may feel like a drain. Thinking about mental illness this way may be very different for you.