My OCD makes me overthink everything that could go bad. For instance, I was recently debating whether I ought to open the garage door and laundry room door while drying a load of wet clothes because there was a new batch of unwashed blankets and bedding in the adjacent bedroom which might emit formaldehyde fumes or something like that, being brand-new. I didn’t want that to get sucked into the heat of the dryer while it was drying. But on the other hand, an exterminator had just sprayed pesticide to kill fire ants outside my home and garage. I didn’t want that vapor to get in either. So which do I do? Eventually I just said “well, well” and dried it with the door closed, but added an extra no-heat cycle to the dryer to hopefully ventilate any chemical stuff that got in.
Exactly what I would’ve done when I came home after the pesticides had completely left the immediate atmosphere. Maybe a week or so. 
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I just couldn’t have a normal phone screen, and Apple doesn’t let you hack your icons… So I made tiny icons (well, I made folders and found a background the same color). Speaking of color, the apps are organized by hue. And this is the only page; it was a good excuse to pare down to apps I actually need.
Overthinking, indeed. And it’s not like anyone has ever said “What an interesting phone screen. When you want to use your AppleTV app, do you think ‘Well, that’s a black icon, so it’s in that folder, right?’ That’s so cool!”
Every so often my garage door opener loses recognition of the remote and has to be reset. I’m embarrassed by how many years I got on a step ladder to reach the reset button on the opener until it finally occurred to me that I could just flip the master electricity switch for the garage off and on.
Most of my overthinking occurs at night when sleep eludes me. I will overthink something stupid I said in junior high almost 50 years ago and wonder if the person I said it to still thinks about it. And of course other times throughout my life. Or if I was at a party or other gathering that day, I will go through and scrutinize everything I said to everyone I spoke with hoping what I said wasn’t taken the wrong way, etc, etc.
^^^ That’s me, too. Like I could have written it myself. Unlike you, though, I don’t think about such things at night, and it’s been much less of a habit in the last 10 years or so. When reestablishing contact with some of those old friends and acquaintences, I’ve mentioned some of the things I regret doing or saying, and what I’ve found is that extremely few have even the faintest memory of what had happened, and none of them have thought it was worth an apology or whatever. I don’t know what you’ve done, but if you haven’t hurt anyone physically or otherwise, you should probably try to be easier on yourself. Sweet(er) dreams.
I’m a Taurus so yeah! I’m also impatient to see results but I’ve learned I have to let stuff churn through the process before I go berserkers wondering why this or that hasn’t happened yet.
Of course those other folks are thinking about the thoughtless / inappropriate things they said that you or others now don’t remember.
Many people are far more self-conscious and self-critical of themselves than others are. Those other people are meantime keeping busy being self-conscious and self-critical of themselves.
In a back-handed way, worrying about your prior social faux pax is kinda egomaniacal. You don’t matter that much to anyone but yourself.
I tend to focus and not get out of the ‘box’ when I have a difficult problem to solve at work.
I’ve solved many a problem on my drive home.
Also, my Wife and I play a lot of chess and cribbage. We do it to get our brains off of work. And also the BS that comes with life. I’m currently trying to get our entire septic system replaced. I’m acting as the GC.
It’s really just changing from one challenging problem to another. But chess is relaxing. If I lose, well, good game honey.
Screwing up a game and losing a queen, is much different than screwing up at work.
There’s one saying I once saw that was of great help in getting over such embarrassments: “Your worst humiliation is only someone else’s momentary amusement.”
I also keep a short mental list of times I’ve seen other people embarrass themselves badly and remind myself how little I care about those incidents, and in turn that that means other people care little about how I flubbed.
I’ma Gemini do I overthink things too. We both do. 
Now, when you say overthinking, does that mean just rerunning a simple stupid or thoughtless act from decades ago, that pops up in the brain at 2 am? Or would it include any of a number of neural complictions?
I came up with the term “neurodivergent neo-complexities” while taking a shower, and I’d long run out of hot water before I had eighty-nine of them codified. I’ve divided them up into six main genres, each sporting anywhere from two to thirteen sub-categories (pronounced sub-cuh-TEG’-uh-ries for… reasons).
I’d detail more here, but I’m only about forty-three percent done with what’s becoming a treatise, a best-seller, and then I’ll flesh it out into an award-winning TED talk and a geniuses-only web site (neurodivergentneocomplexcuhTEGuhries.com). Watch for me on the late night talk show circuit!