It might be more helpful to think of whether you have the potential and desire to become better, rather than whether you are already good enough. even the best of us don’t come fully formed, but are developed in community
It depends on if you want a teaching and research position or a teaching focused position – there are some Universities that have minimal publication requirements because the focus is teaching first, publications second. Ask yourself: what type of academic do I want to be.
I think this is normal – or at least I experienced this. My solution was to find things I was excited about outside my PhD (volunteering, pursuing hobbies) and to reduce my hours for a few weeks. I felt reinspired & much more motivated!