Brother(i think), I feel you. Some days the rumination is awful, and it's good you have someone that reminds you of the good stuff.

My kids are like that - total blank slate joy machines at this age. And I assure you - fundamental optimism is ok everyone can improve their outlook and/or lot in life.

We need to remind ourselves that it's okay to feel emotions across the spectrum of humanity. There is nothing wrong in feeling bad or having regret or feeling shame; just as there is nothing wrong with feeling glee or hatred or sadness. They are normal emotions, but what matters is how we respond to these emotions.

IDK why but one of the more damaging things about American culture is the constantly championing of individualism over community or belonging. Having one person you can talk to or spend quality time with is often enough and we should be encouraging more people to find their tribe.

My wife goes through negativity loops too, it hurts to see someone I love think so little of themselves but we're working through it together. That's life, we need to embrace it.