Forgive me for commenting publicly but some of what you describe shares patterns with ppl living with ADHD. It's not a trendy condition to explain bad behaviour or inability to focus on one thing. But it is a real disorder that's probably very much undiagnosed in the general population.I struggle with this as well. I've always got at least 4 books on the go at the same time, I end up with lots of internet tabs open at the same time as I flit between thoughts, I struggle to focus on one job and end up having to make a lot of lists to keep me on the right track with things. My wife sends me off to do something and finds me an hour later doing something totally unrelated because I got distracted by something that lead onto something else. I'm supposed to be cooking soup right now as it happens...
The reason I mentioned that because I've got some of the same traits as you plus more. I've looked into a cause and explored ADHD. My gp and close family believe I have ADHD.
As a result I've looked into it, done self tests from reputable sources and generally looked into it. Whilst I've not got a diagnosis (I've not got the patience for years of banging my head against the nhs brick wall) I've learnt a lot about coping strategies for ADHD that helped me. Not learnt as much as I'd like because I got bored reading it and checked out half a dozen forums instead. Ho hum.