Hi,
@SianyG , it's perfectly normal to feel down about it at the start. I was a bit younger than you when I was dx'd, 21 (there was me thinking my dad might get me a sports car for my 21st, but, no, I got a broken pancreas, thanks!).
I had a few temper tantrums to begin with: why me, why me, all that sort of stuff.
I'd been pretty active physically, ski-ing, cycling, sailing. I was in such a mess from the DKA (hospital had sent me home diagnosed with "exam stress", getting taken back the next day unconscious in an ambulance kinda convinced them) that I thought, well, that's it, I'm "disabled" and will just be sitting on the sidelines.
Anyway, that didn't last too long. After I started putting weight back on, started learning the rules of how much insulin to take, how to deal with hypos, I ended up getting back on the bike/boat and didn't look back.
It didn't happen overnight, more in stages, but most of us eventually reach a stage where we reckon, ok, I've kinda got this sussed, I can do this.
There's something I want to do, like going backpacking in Asia for 6 months? Hmm, yes, let's see, ok, thought about it, I reckon I'll need to take this much insulin and this much strips (persuading the gp to give me a prescription for that much took some doing, but that's another story!).
There's been times where I've been stood on my skis on a sunny April afternoon looking out over Glencoe, or looking down the length of Loch Maree with a rainbow in the background from my touring bike, or watching deer poking around outside my tent at 5am, or on a boat to an island off the coast of Cambodia, or threading through the Stockholm Archipelago, and T1 has barely existed in my mind in those situations. It's still been there, but only to the extent that I've had to test and inject a bit, but it sure as heck hasn't spoiled the views.
Some people might say, ooh, you're diabetic, are you sure you should be doing that? Heck, yes, once you get a bit more experience in adjusting doses etc. you'll hopefully become less anxious about what you can do, it'll build confidence, and confidence breeds confidence.
There's a few mind games you can play. Instead of viewing it as an enemy, a constant war, I try to think of it more as a wee bit of my body has gone wrong, so I need to help it, me, out. That way, it just seems more like co-operation than a fight.
Or maybe think about it as you looking after a niece or nephew. Sure, they can be demanding, but you're always going to bend over backwards to make sure they're safe. That's what you're doing, going about your usual pre-T1 life, but now additionally just keeping an eye on things to keep you safe by not going out of range too much. Imagine you're taking a niece and nephew to the zoo. The niece is well behaved and stays beside you. The nephew is a wee brat and keeps on running off and you have to chase him. You still love him but he needs a bit more attention. That nephew is your T1, keep him in line, don't let him run away. But still enjoy the zoo.
There's a good book about the discovery of insulin, Breakthrough...by Thea Cooper. It's on kindle. One of the angles is a T1 kid called Elizabeth Hughes, the daughter of a prominent politician at the time. It tells about her life on a starvation diet, her getting closer and closer towards death, and then she becomes one of the first to get insulin, and bounces back. I mention it because the book quotes at length a letter to her parents. She's decided she no longer needs her nurse, decides she's going to take responsibility for her shots, and says, "I'm going to be the captain of my own ship." It's a great way of thinking about it: T1 often surrounds us with hypo/hyper storms and if you're going to be a captain of your own ship, the trick is picking up experience, learning as you go, so that you can weather the storms, and come out of it saying, aye, see, I did that, nae problem.
Plus, you can also cheat a bit! One of the major grinds is the unpredictability of T1. Don't know if you're familiar with it, but have a look at freestyle libre. Instead of getting little snapshots from bg tests, libre tracks levels 24 hours a day and makes it much easier to spot developing hypos, so you can then tail them off with a few grams before they even happen. I've been using it for about a year now and it has made my life much easier. It levels the playing field. It's £100 per month, but it's recently been approved for use on NHS, but it'll be up to each individual health area to decide whether to prescribe and on what terms, so still a waiting game to see how that pans out.
Anyway, just wanted to finish off by saying, sure, it seems grim at the moment, but you'll come out of that tunnel eventually. All I know is that when I'm eventually lying on my death bed, I won't be thinking at all about how T1 has been a bit of a nuisance, I'll be thinking about all the places I've seen when I've been toddling around other countries with a backpack on which just happens to have some insulin in it.