Yes, it was like that. Would be angry if I had to drink it early, without doing work while sipping.
It's mostly the habbit and the idea that you can't quit that is the issue. It does not help that people offer you coffee everywhere.
You can go ahead and leave that cup alone, and nothing bad will happen (besides withdrawal).
You can just do that once you realize your mind lies.
Best of luck to you! I know ADHD is hard.