I don't think my family has any idea how bad my depression is.
Why doesn't your family know how bad your depression is?
I've been hiding it because I don't know how they will react to it.
It's very important that you talk to your family and a medical professional about your depression. I know you're scared to tell people, but you'll never get better if you don't let people know and find help for your condition.
I don't want to tell anyone nor see anyone. I just want to die in peace.
I understand the pain you are feeling but death is such a final thing. You can't go back from that. However, if you give mental health a chance you may find that life is worth living.