Hi. Speaking as someone who has been retired for one year (exactly as of yesterday), as well as someone who had a very demanding job for 27 years and almost no unplanned free time for just as long (or so it seemed), I can tell you that retirement and the freedom that comes with it is AMAZING! :)
DH and I both made lists of things we wanted to do in retirement before we retired. I'm not sure we've even referred back to those lists in the last year. LOL. I should go look for them and see how well (or not well) we've done.
We have probably both gone on tangents where we got temporarily obsessed with something -- DH on projects around the condo, me with reading excessively...but you know what? That's okay. When you're retired, you can do that, at least for a few days and it's no big deal. Our days are completely unstructured. Each day we wake up and say "What are we going to do today?" Some days we have ideas right away, other days we just go with the flow and see what comes along. When it's rainy or the weather is otherwise bad, we might put together a jigsaw puzzle or play board games most of the day...or take a nap...or binge watch something on Netflix.
Give yourself some time to decompress. It took us a few months, seriously. The first few weeks felt like we were on vacation because that's all we had to compare it to. It was a few months before we started really sleeping well and quit thinking about work all the time. But it happened and we haven't looked back. Neither of us has been tempted to keep up the insane pace we had before because, with all the time in the world, you just don't have to.
So look forward to all the things you want to do one you retire and then enjoy them fully. I think you're in for a big surprise once you find out how wonderful it really is. :)
Best of luck to you!