You don't need to put yourself through this. You can have an honest talk with each of your friends and see if they take you seriously enough. Some people want help and others simply like bringing that sort of displeasure and drama to them. For your friend that's in love, there are tons of people out there and if she'd stop focusing so much on it maybe things would come along her way, it's a trap almost, putting all that energy in trying to find someone to love yet ironically you're left with nothing. Instead focus on other things (school, work, family, yourself) and when you're mind is off of it then you break down those barriers that have been in their way for so long. Your friend that jokes around about killing himself, you can talk to him and tell him that stuff like that cannot go on as something as merely as a joke. Suppose he wants someone to take him serious but he makes it come off as a joke and no one takes him serious then he feels bad because he feels like no one cares. It's not your fault if it seemed like something that wasn't all that serious. So that's another trap you have to play it out just to really get the message across, no matter how things are in his life there is no reason why someone should kill themselves, and I hope to see that it isn't some plea for attention either, really talk to him and ask him why he does the things he does, there really can't be a good enough reason to not continue life. Your last friend may be doing these things to try to get you to pay a bit more attention to him, I could be wrong but trying to talk someone out of their addictions is impossible so you have to make sure he wants help first before trying to give any. Just really take the time out to talk to each one individually and find out why, then ask them if they really want to do anything about it. If it becomes too much then don't break your back trying to fix it all, that's not your responsibility, I'm certain you have your own problems to address.
