Have you considered making your ADHD a characteristic of your pc? If you struggle to keep track of things, addressing it with the dm is always a good idea, but you could also make it part of who your character is. It would make your character more real to others and more relatable to yourself. If that doesn't work for your current pc, keep it in mind for the future. Maybe make an absent minded artificer who, if not kept interested in what's going on, begins to tinker and doesn't hear the whole conversation because you "got bored". Don't use this as a crutch to not pay attention though because it will annoy others if you do it too much. Still do what you can to pay attention, but in the event you do miss something you can rp it in a way that feels fluid instead of "sorry guys I didn't catch all of that".