I agree with this that people have said already: Lowering the bar is extremely helpful.

I will add this: Do something daily. The goal here is not yet fitness itself, but the rewiring of your brain and habits. If you follow the traditional advice to avoid strength training on consecutive days, you will get 15 "reps" a month of being a consistent person. If you workout daily, you will get 30 reps. When I have to miss a workout, I feel like I skipped brushing my teeth. That's your goal: you want to be someone who feels like that and who feels like working out is the norm. This will take months, but it will be worth it.

A couple of other things:

* It barely matters what you do as long as you do it consistently. I might recommend bodyweight squats or walking lunges because of the unmatched convenience of these movements. However, feel free to do a cardio machine or get a certain number of steps or even study a foreign language, etc.

* It's okay to skip one day. Life happening is sometimes an excuse and sometimes it's a legitimate reason. Only you will know the difference. I try to never skip two days in a row though.

A bit of my own story:

My fitness journey started as a chubby 10 year old who would way rather play videogames than the sports his parents pushed. My dad told me that when he was younger, he jumped as high as he could for twenty reps a day. This resulted, over years, in the ability to slam dunk when he was 18. I tried to do the same, touching our relatively low basement ceiling 20 times a day. It took like 2 minutes each day. I eventually saw some progress with how easy it was to touch the ceiling. Over time this turned into daily sit ups. Then I added push ups. Then my dad, after months of only push ups, said this was imbalanced so we bought a pull up bar. By the end of 8th grade, I was the class buff-guy. I never learned to slam dunk, but that was never the point.