I'm looking for another way to say: I couldn't help but ponder the long list of reasons I am unworthy/ a failure.
3 Answers
You could say something like: I couldn't help but ponder the litany of my failings.
a usually lengthy recitation or enumeration a familiar litany of complaints
a sizable series or set a litany of problems
Along the same lines, catalog and host would also work. "I worked through the catalog of my failings", or "My life consists of a host of failures"