I don't have advice but I can offer a few thoughts. Depression is awful... no doubting that. But experiencing it can be an increible learning experience for some. You learn who your real friends are. You learn what real friendship is. You can learn what's really important in life. There are no guaranties in life. There's no way of knowing if you'll ever go through depression again... but there's no point in worrying over the possibility.
BTW nobody who is still trying is a loser.