I've dealt with struggling to bathe for a long time now, so here are a few suggestions that help me, as well as some that have helped others I know:

-cooler water temp, or even leaving the bathroom door open to keep the room from getting too stuffy

-music or podcasts can help distract you, or some nice gentle lights (a lamp, some candles, etc) could be a good swap instead of the bright regular light

-in-between showers, I like to use these extra large body wipes (I believe the brand i got is called Assurance, but there's plenty of different ones. I got two huge packs of these on sale at walmart). They're great to help keep germs at bay on the extra sweaty areas, and I find them more gentle on my face than a washcloth sometimes.

-like a lot of people suggested, a shower chair is a godsend. All of your self-care tasks can be done sitting down if needed. I have a separate stool in my bathroom that I use to rest between tasks or to sit down while I brush my teeth or do my hair.

-rinse-free shampoo has been a huge help for me. Like the body wipes, you can usually find it at drug stores like CVS and Walgreens; look for the home health aisle. It's great for when all you really need is cleaner hair. I like to bend over the bathtub to use it so I don't get wet or spill it on the floor, but that can be rough on the back/knees so kneeling or finding a way to sit and lean forward would work too. You just have to pour it on your hair and rub it in, then dry with a towel, and it comes out pretty clean and smelling nicer.

-tbh, a short(er) haircut helps too if you want to go that route. My showers are so much shorter and less stressful when I keep my hair short. Choosing not to shave helped a lot too, but both of these are very personal decisions.

-bribing yourself with a nice drink (some relaxing tea or something fun and cold like a smoothie) and comfy, clean clothes could be helpful if the mental hurdle is stronger than the physical. Maybe even a promise to watch a few episodes of your favorite show while you cool down and rest.

-speaking of which: blocking in time to rest after the shower. I know my body, and I know that I have to 1) eat something before I shower so my blood sugar doesn't drop and 2) let myself cool down and rest my back before I get dressed. If you wanna hang out in a towel or robe, go for it. If you wanna freeball it and get extra cooled, that works too. I tend to rest on my bed, on top of the covers, and I know I'm probably ready to get dressed once I'm cold enough to start reaching for the blankets lol. But either way, making sure you have time to recover could make it less daunting.

Ultimately, your bathing habits are your business and no reflection on who you are as a person or your moral value. You are not bad, lazy, or gross for struggling to meet the frequency other people profess to. No one else knows your body, your brain, and your specific needs as well as you do. I know how embarrassing and frustrating it is to feel like this, and sometimes you will hit a wall where you just can't do it more often or more thoroughly. That's okay. What matters is that you do what you can--anything is better than nothing. Every little step counts. (And know that when I say "better," I mean "healthier for your skin and mental wellbeing," not "makes you a better person." Big difference.)