Oh don't be too hard on yourself for polluting rankings, search engines are supposed to be good enough to not recommend someone's personal blog if it's irrelevant to their search. Assuming this is the catalyst for trying to avoid search.
I empathize with feeling as if your content is useless to others, but you really can't know what people are going to internalize from your writing. A post about someone you met could feel too mundane for you, but to someone else could be the very reason they make an important decision in life. You really can't ever know what someone else internalizes about it (unless they tell you about it!) so don't let that reason stop you or make you feel like you're polluting anything, you're doing the opposite of polluting rankings!
I empathize with feeling as if your content is useless to others, but you really can't know what people are going to internalize from your writing. A post about someone you met could feel too mundane for you, but to someone else could be the very reason they make an important decision in life. You really can't ever know what someone else internalizes about it (unless they tell you about it!) so don't let that reason stop you or make you feel like you're polluting anything, you're doing the opposite of polluting rankings!