This really resonated with me.
I'm the same way. Through therapy, I'm beginning to see that it has a lot to do with, as someone said above, needing to know how I feel about things, knowing what label to put on things or what box something goes in, because that was my defense mechanism growing up with two very critical parents (one being a rageaholic). I had to figure out what "good" was (or in my case, "perfect") so that I could avoid being at the center of harsh criticism or screaming fits.
I totally get that, that it's so hard to let it go because then, how do you know where you stand on something or what you think?
I love the mantra, it's none of my business.