How to tell your parents you suffer from a mental illness?

I think I have clinical depression and a couple of other problems. I've tried to deal with it myself with the net, but oof! The pain! I can't. I can't deal! I don't really want to tell my parents because they'll think I'm making excuses because I'm a teenager, but I've had it since I was 5! :\ I don't know how to tell them.
Help?!
I've tried to tell them some things before, but I get beat and they just don't get it. They won't support it. I have to get straight A's or die! I have to die or take it.
 
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