Difficultly with visualising the steps to complete a process is an ADHD symptom.
Finding it easier to stay on-task with someone else in the room is called ‘body-doubling’ and is an adhd coping strategy.
If your therapist hasn’t sent you for a ~4 hour dedicated assessment, they can’t say you do or do not have adhd.
My therapist was like; “Maybe adhd, but not autism.” I 100% have both.
So get a second opinion.