Wasn't really allowed to harbor or express anger as a kid. Now I can't summon an ounce of rage, even when it's appropriate and helpful. It's not ideal, so I spend a lot of time meditating, dropping away other emotions in hopes of finding a spark of something in there. Nothing yet, but I've found a number of other useful things in the process.

Mindfulness is a great skill to build to debug issues like this. It's slow, painful sometimes, and doesn't always feel worthwhile, but it's definitely worth taking the time to try meditating to get closer to your base emotions and how they appear.

Worth remembering too that what you're looking for probably isn't a huge shift in thinking, at least in the short term. Incremental progress over time is all it takes. Some people are shades of tightly wound and that's okay. You're who you are for a reason and it's worth being kind to yourself when unhelpful thoughts appear. Not to excuse yourself of behavior you don't want to maintain, but to care for and guide yourself toward a simple step in the right direction.