Postmodernism, Post-Truth, and Democracy

You'll find references to "my truth" in plenty of self-help books, and we're frequently encouraged to share our experiences, opinions, and stories about how we perceive ourselves and our views of reality. But is the focus on "my truth" a sign that we no longer believe truth is something that is shared? And what are the stakes for democracy if citizens no longer hold certain truths in common, or even share the same reality?