Confused teenager with suicidal friends?

A large number of my friends are either really depressed or are suicidal, they all tell me about their troubles which makes me feel sad and miserable myself. Are these people drawn to me because i am a good listener? everytime i talk to them i feel like a wilting flower the next person tells me their troubles and a part of me seems to die along with them. should i stick by them and cope with feeling down because they are my friends or not? sorry if this seems like a rubbish question