Welcome, Jacob. I was just about the same age as you are now when I was dxed. Looking back, nearly ten years later, it was a confusing and transitional time in life to begin with, and dealing with something like this completely out of the blue in the middle of trying to figure out who I was going to be as a grown-up was an extra challenge. On the other hand, T1 was a reminder that nothing in our lives ever turns out the way that we - let alone anyone else - expect it to, and maybe helped me realize that I needed to go for what I wanted out of life and not be as afraid of doing the unexpected.
Good luck with the pump. I've been on it for quite a few years, now. Everyone's needs and experiences are different, of course, but I have
found it to be a useful tool for improving my control that I was never
able to achieve with injections. In terms of convenience, it definitely
has quite a few perks compared to injections, as well as a few other
annoyances that you'll learn to live with. As far as specific advice, I think if you've gotten the hang of injections - and obviously you have, as you've been dealing with this for going on a year now - you'll figure this out, too. There's a lot to learn at once, but ask questions if you don't understand anything and don't be too freaked out the first time you get a bad infusion set or some mishap occurs with the tubing or the adhesive. Just test often and have what you need on hand in case something appears to be going wrong (extra pump supplies, insulin, and backup syringes as a last resort).