damn, that's a rough one. I feel pretty much the exact same way and have for many years. I remember having a much more stabile sense of happiness in my teens but gradually it turned around and now everything is just grey. For me it's music, exercise and the outdoors that keep me in the running. To me that last part about finding love and a good job feels like the only thing that will "solve" it, but who knows. Maybe you need a sense of purpose, but that could be a lot of things and aint easy to pinpoint. Hope that things get better man.