How do you cope with depression when its not normal depression?

Im so depressed in my life right now. But the thing is my life is grate. Its my friends lifes that arent. I have boyfriend and hes amazing (not the same stalker creep I asked how to get away from in another question bbut a really nice guy). I have passing graes and great friends. The thing is that their all depressed. A kid killed himself and was really close to three of my friends. They never knew what he was doing. He didnt go to our school so I have never met him. After that the closest friend of the kid who killed himself killed himself as well. They just couldnt live without each other.I didnt know him either but it made things worse for my friends. I dont knwo what to do. I feel like if I dont help them ill drive myself insane with guilt for not trying to make them feel better but if I do then I have to cope with all their problems and some of my own such as school and my mother and my little brothers. Everythings a mess with them. I feel like I should fix it. I just feel so overwealmed I’ve gone into depression becouse of it. I can admit I tried to stab my wrist with a pin but it wasnt sharp enough to penetrate the skin and my friend who was online at the moment talked me out of trying it again. I’ve had a pounding headache for the past week or so just from all the stress. I have like 9 or ten fiends that I could name off that have troubles. I know I need to fix them. I know I should but I have to keep my own head above water at the same time right? So what should I do? Die of guilt? Or die of insanity?