Have you ever wanted someone so much that it completely ruined your life?

Im in love with this girl!! But she doesnt want me back. Which has caused my depression. Im on medication for depression. And i go to therapy. I just dont know what to do. Im bisexual and i really like her. Shes never going to like me because im a girl. Sometimes i think about just ending it all.......shes my best friend! theres nobody else i want to be with. Just her. But since shes not going to ever be mine i cant stop thinking about shooting myself......