It's a problem, but I don't think it's as unsolvable as that. Figuring out how to overcome the strategies being used to divide us could rapidly repair the damage. Education, both in and out of school, is a crucial element of that. The ones frothing over "liberal tears" clearly don't want to find common ground, so we would need to learn how they communicate and why they won't listen, then find a strategy to break through that barrier and help them on their way to broader skepticism. In essence, once we cure the disease, we need to vaccinate them to mitigate the next outbreak.
There's been some focus on this area of research. We have evidence that "strong men" rise to power by capitalizing on fear and anxiety. They set themselves up as a savior who will get rid of the scary problem by blaming someone/some group that is innocent but unknown (and therefore a suspicious stranger) to their base. They start with (comparatively) small lies and build trust among their following. Once the more suseptible slip into this form of groupthink, they'll fall for bigger and bigger lies, and are very difficult to recover. The question is, how do we wake up they who scream of "sheeple" without an event so tragic it traumatizes an entire generation? The last few times involved massive wars or similarly harrowing events. Events so massive they dissillusioned the followers and forced them to confront the fact that they got played by a charismatic (to them) narcissist with a superiority complex.
Unless we can figure out how to snap these people put of it relatively peacefully, we're most likely going to be in for a really, really bad time before it gets better. With any luck, at least in the US, maybe Trump will get thrown in prison and the Republican party's leadership will turn on Trumpism or collapse before they can take control. Maybe if their chosen authority figure is imprisoned and disowned by their team they'll be able to see clearly again.
I hope your new diagnosis helps you. Learning more about how you think, what motivates you, and what holds you back can help a lot with choosing realistic and satisfying goals. If you keep at it, I think you'll figure out how to achieve something you can call success.
And for what it's worth, I don't think it's possible to be a failure, but I do understand the pain of defeat. Thinking more about it, defeat seems like the pain of wanting something, believing (correctly or otherwise) that it's impossible, and then continuing to hold onto that desire. It's the gap between what we believe to be possible and our expectations, not all that different from grief.