I do this with every single thing. It can be a course, learning the piano, taking exercise classes, taking multivitamins, doing my physio, lasering my legs, reading with my dc, - it can range from not so important stuff to very important stuff but it doesn't matter, I'll throw myself into research and book things / buy stuff and don't last more than a month tops.
I'm sick of it. Why do I do this? What is wrong with me and more importantly how the fuck can I stick to a thing just even ONE thing at this point would be amazing.
I don't have ADHD or not autistic I don't think. I really don't understand it. I think I have been like this as a kid but it wasn't so bad then, it's much worse now as an adult.