As someone who is ADHD (though not sure to what extent i.e. mild vs severe), I completed my Computer Science degree and was less determined than you were. In that respect, you will be fine. Everyone goes through this and feels overwhelmed by the workload, but you will make it through. I developed non-medicated ways to cope (e.g. will make sure I have a lot of alone time for my brain to recharge, put EVERYTHING on a to do list right when I think about it so I don't forget, do small tasks immediately also so you don't forget, etc). You will find a way that works for you in time, so don't worry about that. Overall, I found that my interest in CS was overshadowed by other interests given what is probably a shared tendency to come up with lots of ideas, be creative, etc. I feel like there is a lot of pressure for people capable of completing engineering coursework to study engineering and take engineering jobs (especially since coding is hot right now), but I encourage you to really take a look at what your strengths are and what you love to do. Maybe you'll find that it's CS, but if it's not that's okay too. College is primarily a time to learn about yourself and what works for you. It may seem tough in the short run, but you'll make it through a stronger person. Good luck!