How old are you?
I agree. The doctor is not the one who decides you are ill, the doctor simply helps you to deal with and treat it. It sounds like your case is pretty mild, as in, you are still managing to live you life ok.
Try doing some reading up on schizophrenia and learn about it. There are treatments, and if you start being treated now you have a better chance of maintaining your ability to live your life, you know what I mean?
There are not any natural remedies that I know of. It's definitely a brain disease, and should be treated as such. Don't feel bad about it, it's not something you caused or can control- but you can control getting help and not letting it get worse.
I wish you the best-
HUGS