I can relate to most of these comments, at least to some degree. I usually try to have at least one crash day a week in my schedule (this summer that's not happening and I've been incredibly anxious as a result), and that day cannot have *anything* scheduled, even fun. If I do have a whole day off, but see my boyfriend, then I don't feel like it was a day off, it was just a pleasant kind of full - like getting stuffed on cake instead of vegetables, you may enjoy the cake more but you'll still feel full by the end. This summer, I'm actually seeing a psychologist once a week, and I've put my availability at both of my jobs as not available to work the day that I see my psychologist, so my only commitment that day is my appointment... but that day still feels full. On a related note, I will not make plans with less than one week's notice, and prior to my diagnosis (at which point I started rethinking my definitions of the world), I thought it was incredibly rude for someone to try to make plans with less notice than that. If someone asks me if I want to do something with only a day or two of warning, I'll generally say that I'm busy, even if "busy" just means sitting in my room procrastinating on homework.
I have the same tendency to be early for everything, but I think that comes more from my musical upbringing; I started playing the violin when I was 3, and for any sort of lesson or rehearsal you're expected to be at least 15 minutes early to take out your instrument, tune, etc. If you're not 15 minutes early, then someone is stuck waiting for you - in an orchestra setting that can be your standpartner, in chamber music that can be the whole quartet/trio/etc, in a lesson that can be your teacher, but regardless of who, being less than 15 minutes early is disruptive. But if someone is coming to see me, I'm generally not really prepared (emotionally, mostly) until the time they're meant to arrive. I may have everything tidied up and set out as needed, but I'll be counting on that last minute before their arrival to send one more text, practice one more scale, read one more page... some sort of preparation that I rationally know isn't necessary, but which feels necessary at the time nonetheless. So when I AM early, I'll usually wait outside until it's time unless there's some sort of waiting area.