Suicidal thoughts/depression? Help?

Let me start by saying that doing like that will not make it better. If your parents aren't taking you seriously, try mentioning it to a teacher or counselor at your school. Just ask if you could speak to them alone and explain to them kinda what you wrote on here. If you don't really know how to start the conversation try just giving them a copy of what you have written here. Your teacher or counselor should get in contact with your parents which should cause them to take this more seriously. All I can say is please talk to someone, it will help and don't give up hope.