16 and I'm not happy when I'm sober?

The only thing I ever look foward to these days is the weekends which I spend getting drunk. Lately after being used by a guy I liked, I've been getting out of control when I drink... Such as crying, and drinking uncontrollably till I throw up and passout. I just don't care anymore. I don't understand the world and it frustrates me. I overthink things to much, and there's just so much tradgedy in this world that I don't understand how anyone can be happy. I feel like I'm just going to die young from cancer or a car crash or some sort of freak accident, and it's preventing me from ever having fun. Sometimes I'll think "oh I can't wait till I'm 18 and can go travel the world" but then I'll think "if I even live that long". I'm always filled up with false hope... So why should I feel any different about my future?