Help! I have no urge to live anymore. I mean what's the point?

I am gonna die anyway and leave this stupid stupid unfair life. So why bother? I can never trust my future to be as good as I wanted it to be. You can say that my low self esteem and the complete unfairness of the world are crushing me down. I can't feel anymore. I don't know what makes me happy anymore. I have become dull. when I was in grade 9, one of my best friends told me that I have turned to be so pessimistic, I laughed at her back then. But when i look at myself now( a 17 year-old girl), I acknowlege how smart she was to have figured out my pessimistic attitude before I even felt it. Because of my low self-esteem, pessimism, and the unfairness of a long problem that I have been through I don't know who I am anymore. I can't go on in life so blindly hoping that may life would turn out to be good. Because if no one told you before: "Life sucks and then you die" Life is stupid and unfair and cannot be trusted.... I am so depressed and empty. I am afraid to have hope again. I am losing my mind. help!