I don't forget to shower, but when I'm very depressed I just don't care about it and have to force myself. I do have an idea or two for that might help you remember if you want to try it.
Set some sort of special alarm that has a distinctive sound and goes off at whatever time you set each day. Not your alarm clock sound, because you want the eventually start associating that different sound itself with "it's time to take a shower". Now, I don't know a whole lot about technology but on my cheap little cell phone I can set different alarms at different times on different days and set the sounds to different ringtones. So if you were to set your regular alarm for whatever time you get up then set the second one to go off maybe 30 minutes later to remind you to shower, that might work. You might also need to put up some sticky notes on the bathroom mirror or leave notes for yourself at first to remind you what you set the second alarm for, but I'd think after a few days or so you would associate that sound with going and showering right then. And make yourself go do it too, right when the alarm goes off.
Also, when you are invited somewhere you could go ahead and set the alarm days in advance, when you get the invitation right away, and set it to go off maybe an hour or two before you leave home. After a few times of doing that it may become habit to just set the alarm in your phone to shower and start getting ready as soon as you are asked to go somewhere, and because you can do this days in advance on a phone, that could work out good.
I don't know what other technology is out there like that, but I'm betting you do. I'm almost 50 and don't keep up with that stuff, but my kids do and you are in that age group. Also, put up a note about brushing your teeth there in the shower too so you'll see it. Or you could just keep your toothbrush in the shower and brush in there like one of my kids used to do.
Good luck and let me know if that works for you.
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I'm giving it another shot. We will see.
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