As above, OP, you’ll be able to carry on doing the things you’ve been enjoying, you’ll just have to try to be a bit more aware. Easier said than done, I know. :|
I was diagnosed at the tender age of 30, I’m 56 now.
For long days of MTB, I have a bottle of High5 in the cage, water in the Camelbak bladder and gels and cereal biscuits handy. I try to set off with my bm at about 10 and sip from the bottle when I remember. If it’s a road ride, one bottle of water, one of High5
Bm test kit and insulin fit in the Camelbak or back pocket easily enough. When there’s a stop, run a check, sort it from there.
You’ll find your own way of coping, any mistakes you make, try and learn from them.
Hopefully, your diabetes team will be able to help, but as above, you might have to show them that you’re interested in learning.
See if you can get on a DAFNE course, it’ll help lots, even just chatting with the other diabetics on the course, you’ll find out that you’ve all got the same/similar issues.
Good luck!