system
Given the following post, respond as if you're commenting on Reddit:
human
If my brain can identify what it needs to change for me to be more confident, happier, a better person, etc. why doesn't it just change?

I hope I worded that right. Is there any scientific explanation as to why the brain doesn't just fix itself since it already knows what's broken? That would also be a great advantage for the evolution of our species.
gpt
Not necessarily an explanation, but this might be helpful.

Psychology and neuroscience often times use computers and programs as a model for the brain. Much like the human brain, computers and programs are constantly changing, new information gathered in different databases, and a whole lot of trial and error. When a program has a bug in it, or there is an issue with a piece of computer technology, it generally doesn't fix itself. Neither can the brain. While the brain is self aware, it only has the ability to problem solve within the realm of past experiences and previously used tactics. This is much like using a computer's troubleshooter or diagnostic--that little box that pops up that says "windows is attempting to fix this problem." Generally it can find the problem and suggest a solution that sometimes works, but sometimes doesn't. It's all a work in progress.

On a more biological and slightly philosophical level, for something like a self-correcting brain to be possible, we'd have to be born with the methods to fix problems like being more confident, happier, a better person--or have those things kind of "form" later in life, like maturing during puberty. Thus far, we haven't evolved to pass anything like that on. Who knows if that's even possible.

A lot of people don't treat their mental health as an actual biological health--something that involves chemicals, hormones, electrical activity that we are not always aware of or have the ability to control. Personality and happiness have biochemical determinants that we have not yet discovered yet, but trust me, they're there. We can know that we're sick in our bodies (pain, tiredness, etc.) and identify the problem (the flu, high blood pressure, even cancer). But at that point, our cells don't just switch around, antibodies kick into high gear, concentrations of this and that magically decrease. We fight it with what we have at our disposal: diet, exercise, drugs, supplements, rest, etc. Our brain fights its problems with what it has at its disposal (or at least what it knows of)--support, problem solving, seeking therapy, taking drugs. But ultimately, just like your body, in conjunction with whatever techniques it chooses to help it, your brain has to find a way to "work through it" which may or may not be successful. 

TL;DR our cells in the brain and body are not self aware, nothing is perfect, and we do what we know.

*Source: several years of university psychology/neuroscience classes, labs, philosophy, personal reading.