I'm in the marine corps I hate my life I'm hoping to get out soon but it's not hopeful. I'm always depressed. ?

I see no reason in living anymore. I guess if I got out I might Feel it's worth trying to find something worth livig for. Even then it's doubtfully. My question. What's worth living for? If heard lots of thing like people and friends. But they'll get over it. They obviously feel like lifes worth living so they'll get over it like everything else.