Is being emotionally muted normal ?

Ever since my severe TBI (about 1 year and 3 months ago) I have felt incredibly emotionally muted. Not just a flat affect but like I don’t feel anything to the same degree anymore including anger and frustration.

I have read a lot on here about people’s issues with anger and or emotional regulation. I feel like I have a hard time relating as I barely feel angry ever, even though I really should.

Does anyone else feel similarly??