FADE INTO YOU
There is no need to write a public blog, a sort of personal journal is perfectly valid.
You will live more focused. If you constantly write about your thoughts you will never get out of sight what you want to achieve, which your dreams are.
You will overcome tough moments faster. There is some research that suggests that those that write about what is happening overcome tough moments quicker than those who don’t.
You will have a lot of written memories. If you write each day, you will have a historical record of your thoughts, probably something much more interesting than a simple photo album. And, who knows, maybe you end up publishing a book ;)