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.
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.
Something I have been struggling with all my life is deciding whether I am flawed in some way, or the other party/the environment is - because my immediate reaction is always to feel responsible and inadequate, and it takes a lot of energy of confidently feeling superior or right about something. Like, is it a pattern, or am I reflecting to avoid being ignorant?
There's no need to feel superior: that's not particularly helpful and will tend to give you a distorted perception of reality. Most likely you're just average.
One way is to define what you view as good (or better: define what you view as "better") and just be that as much as you can. Because "trying to actually be better" puts you above the median person immediately, IMHO
Why did you read the message and think of negative self talk? I'm just trying to learn more about your point of view.
I was just pointing out things where I struggle.