How do I talk to my parents about this?

Im a 13 yr old girl and Im so depressed. Ive cut for a while. While cutting the other day i was so close to just cutting deeper but I dont have the guts. Im so sad all the time. I dont like anything. I always want to cry, now i can't very much. I feel like I will but no tears come out. Ill just be huddled up in a ball in my bed thinking about how much I want to die. Im too much of a wuss to kill myself. My parents just think its like a "growing up problem" as they put it but its not. Its so much more. I dont think they know that I cut and contemplate suicide everyday. I go to a counselor but its not enough. I want to be on medication or go to stay in a mental hospital or something. I am super shy talking about this (of course) I couldnt even tell my doctor (not counselor, I was there for a physical without my parents there) That Ive been really sad lately. I totally lied and said I was fine. How can I go to a hospital or get meds if I cant even talk to them. Im not very close to them. Im thinking of writing a letter and leaving it for them before I go to school or to sleep over camp for a few days but then when I get back they'll want to talk and I wont. I dont know what to do. thanks. sorry this is so long