I'm the community leader here and will echo Donna's advice: you need to see a psychiatrist right away to get an accurate diagnosis. The earlier you are treated with medication and therapy, the better the outcome will be.
People with schizophrenia often hear what's called "command voices" telling them to do things. In some cases, like your own, the voices tell you to harm yourself.
Now: imagine you had to live with those voices for the rest of your life. You could live to be 70 years old and hear those voices for 60 years.
Or: you could get treatment and possibly be totally free of the voices and have a better life than the one you have now.
Are you writing to us for confirmation that what you describe is OK? this sounds like schizophrenia or another mental illness to me only I cannot diagnose or treat what's going on.
I will tell you to be honest with your parents and go immediately to see a doctor who can indeed diagnosse you.
My name is Christina and I was diagnosed with schizophrenia when I was 22. A day later I started taking the medication that halted my symptoms within three weeks. I've taken the medication every day as prescribed for over 18 years. I have a job, friends, loving family and actually by the way I have a day job and two other jobs on the side.
So there is hope and recovery is possible.
What you describe sounds like it is frightening to deal with. Given the choice I would not want to hear voices telling me to kill myself.
The idea that you said you can only trust the voices leads me to believe that something else is going on in your life that you're not being honest with yourself about or that you're afraid to talk to other people about.
Only an online forum is not where you need to be right now. You need to talk to your parents, a school guidance counselor or someone else who could go with you to a doctor to get the kind of help you might need.
Please talk to someone as soon as possible.
Like I said, people with schizophrenia, like me and the other community members at this web site, have had success with our recoveries.
Schizophrenia might sound scary however it's just a word and anybody can have schizophrenia, there's no shame in being diagnosed with it.
So talk to someone in person who can help you get help.