Why is everything so fucking tiring.
Someone make it stop.
My explanation is that life wasn't made to be fulfilling, pleasant or anything that pleases us. It's just caused by self-replicating molecules that are successful in self-replicating replicate. And evolve to become ever more successful, with a subset of those molecules being our genes, amongst those with everything in life. There wasn't any intention behind it, least of all the intention that life would be agreeable.
I'm tired most of the time. Often I sigh to myself, "I'm tired" and then I say to myself "of course you are tired, you live". Then again, my mental illness, consisting among other things in an over-sensitivity to all kinds of stimuli and an unhealthy tendency to take all the misery of the world on my shoulders as a responsibility to solve, plays a part in the continuing feeling of tiredness also.
And even though I'm autistic and the classic caricature is people with autism tend to function well with repetitive tasks, everything that doesn't get solved but continues to come back, like cleaning the house, cooking, washing, doing the laundry tires me from it's sheer uselessness. House clean, well-fed, clean clothes? You can do it all over again in no time. The need to eat in few hours, the need to tidy your house in a day, the need for clean clothes a few days later. There is no end to it.
Sorry for just being able to say I agree and finding lack of comforting words. I feel the same way you do.