Not quite the same as you, I was initially diagnosed T2 at age 42, at 47 switched to insulin and last year at age 62 had my diagnosis changed to T1 (which it must have been all along). Despite being on a basal-bolus regime for some 15 years, the T1 diagnosis was a bit of a shock and hit me in ways I would never have thought.
The main thing I would say to you is that you have had a diagnosis and now getting help to understand it all and get things under control. Glad you are already getting better energy levels. One of my first DSNs told me that only when my BG was back on a normal range would I then realise just how tired and lacking energy I had been. She was right!
As to your thoughts about being active, travelling, looking after grandchildren, etc. - I do all of that and still working full time (albeit permanently from home since 2020!). Yes, you do have to think a bit more and plan, making sure you have all your stuff with you, but that very quickly becomes second nature. I have travelled long haul as well as driving lots around this country, all with insulin, BG meter and more recently Libre sensors. No problems travelling at all, even crossing time zones, being in hot climates or whatever. You just need to make sure you have enough supplies with you for diabetes and take it as carry on if flying. Don’t let diabetes stop you from doing anything.
Hopefully you now have the Libre, which I started last July. It is definitely a game changer and now I’m really learning about how my body reacts to different foods and more able to better judge pre-bolus timing.
I would wholeheartedly recommend Gary Scheiner’s “Think Like a Pancreas”. It is written in easy to understand language and is so helpful in understanding how to use insulin to achieve a good HbA1c.
Plus, you have found these forums 🙂 There are lots of people on here with loads of experience so you will definitely get ideas, advice and support in bucket loads!