When I was 6 years old I saw my great grandmother die right before my eyes. It's true that it doesn't really affect you then, because you don't understand it, but when you're older, it does mess with you a bit.
I have had other relatives, and a few classmates die as well. Very odd feelings, of course.
I've never known anyone to kill themself though. There was a night where I saved my best friend Sarah's life, and there were a few nights that I attempted, but I'm glad to say I'm still alive now.