I wouldn't do it out of fear that someone else might find it and read it. Having been witness to the fallout of such an event, friendships were ruined, a relationship ended, and there was much emotional pain.
Some things are just best kept inside one's own head.
I'm partial to burning my journals after some time. It's highly cathartic to see your thoughts and feelings scribed onto the page and removed from existence, as if to underscore the fleeting, temporary nature of them.
Such thoughts never do more harm than when they are trapped in our heads. Fortunately, paper notes, unlike digital ones, can be made to disappear without a trace.
Some things are just best kept inside one's own head.