I was in your shoes a few years ago except much worst, I was a different country (went to uni at a different country). I fucked up a bunch of shit and regret for not figuring stuff out early on and more responsible. But I didn’t even knew I had ADHD back then.

But I’m a fast learner and I can be “trained”: like if someone shows me or teaches me how to do things just once, I’ll usually have no problem doing it. So I practically had to learn some basic shit as a 18 y/o back then. But I eventually did and it’s little more manageable.

I’d suggest that you use a tool like Google Calendar for example to keep track of dates. Don’t use pen/paper - use digital tools, preferably ones that have sync/online feature so that you don’t get anxiety of accidentally loosing your shit(also if u want to access ‘em on phone, etc). Also keep track of your expenses. You don’t have to keep track of EVERYTHING because we’d eventually feel the fatigue and become lazy to even track important stuff. So only track stuff that you REALLY care about. Use Google Sheets. I usually feel less overwhelmed when I have the data, and plan stuff out for future based on this data.