Sure, I've felt like that before, mostly when I was a moody teen, but not for such an extended time. As if you're spinning your wheels and not enjoying anything? The world is full of hypocrisy and suffering, and there aren't many bright spots, and the few bright spots can't be appreciated because of the weight of all the bad things, yes?
It's a common affliction of sensitive and introspective people, who tend to feel it more harshly. Many great writers and artists have felt that way - two of the best examples I can think of are Vincent Van Gogh and Leo Tolstoy.
Bungleau and Dron_Cah have good advice. You're kind of in a rut right now. Try to expand your horizons and meet interesting people (the bar is not the best place to do this
). Get more sleep, more exercise, more sun, and make more little goals for yourself. Try out a sport, walk on the beach, take up yoga, volunteer, play an instrument, whatever. Try to live in the moment and not dwell on the negative things.
Almost everybody goes through these little bouts of dissatisfaction and depression at some point in their lives; your happy friends have too, or they will. They may even be going through it now, but cope by acting happy in public. Many people "cope" by getting drunk or high as often as possible.
I've gotten to the point where I recognize the onset of my occasional bleak moods, and I actively do things to snap out of it; upbeat music, exercise, positive thinking, amusing literature, etc. One of the worst things you can do is wallow in the feeling, because it's a downward spiral. Good luck, Sigmar.