Thinking positive will do nothing to remedy any of that, except, perhaps, the self-doubt. Any foray into positive thinking to soothe said self-doubt may simply result in deluding or failing to motivate myself. That does not sound like a desirable outcome for my skeptic self.
There also seems to be an over-riding theme of general ambivalence. There are rationalizations galore available for all of the personal issues (though none at all for the global ones), but it seems impossible to pinpoint actual causes or to project results from a course of action.
I should also note that despite all the personal complaints, our life is genuinely excellent and complaining in the context of being a white-identified American is without a doubt, whiny and obnoxious. It is also, fortunately or unfortunately, the truth.