Why would you be afraid of the police? And depression is FAR from insanity, so don't worry about being crazy. Is there someone you can talk to? Maybe a relative or friend? It sounds like your parents really don't understand mental illness--they usually don't. Try and get contact with some type of therapist, even if it's just the counselor at school. There's also this great thing on the suicide prevention hotline website. It's called Lifeline and you basically just chat with someone over the phone or computer about how you are feeling. They're specialists, so they help you decide what to do from there. I hope this helps!