I'm suicidal and my parents don't know
How do your parents not know you're suicidal?
I cut them out of my life around the time my girlfriend broke up with me.
Suicide is a serious thing and hiding it from your parents is irresponsible. Let them back into your life and let them help you with your problems.
Nah, I'm going to kill myself instead of dealing with it all.
I really hope you don't mean that. I think you should reconnect with them and maybe they can even help you out with your depression.