Could your medication be changed that doesn't make you feel doped? From what I understand a person who is schizophrenia is not totally aware of things when they are off their medication however they feel as if they are totally aware of their life and actions.
It sounds like your family has seen you when you are not taking medication and your behavior frightens them and they only want the best for you.
You can lead a normal life as much as you can by taking a medication that works for you and you can make friends.
If I was hearing voices, negative or positive, I would not want to hear them at all.
When some take their medication they feel normal again, therefore they stop taking and go downhill.
Be honest with your parents. As if you don't they will know that you are not taking your meds...
~Zig