I'm also highly intelligent and have some pretty serious ADHD. I'm now 39, but in my mid twenties I was in a pretty similar situation, it sounds like. I took out some loans and signed up for another bachelor's degree in a field with job prospects. For my first degree I went to a state school next to my home town and studied music, then became a guitar teacher, which allowed me to live in my mother's garage and endure her daily shaming about how I needed to get financially independent. I was only a mediocre guitarist, despite my best efforts.
But my point is, I learned that I can get things done and pay attention to details as well as anyone else if I try. I just have to have systems to keep myself motivated and enough things to keep me interested to soothe me and help me calm down. Special interests have been my saving grace in life. My life is far from perfect. I struggle to maintain close relationships because I'm so idiosyncratic. But I'm living independently and doing a job I enjoy, and gradually learning to act like a real adult in my community. So I have complete faith that you can be successful too if you put in a lot of effort over time, if you want to.
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⚠️ Warning: User is prone to apparent non sequiturs.