Out of the different ADHD symptoms, which one is the most challenging one for you?

Since I was 12 or 13 I suspected that I had ADHD (and my teachers did), but I was always too scared to go and get a diagnosis because I felt like this would mean that my symptoms are "set in stone". I've found different behavioral tools and explored a lot outside of medication - so I'm curiuos what aspects of ADHD are most challenging for people.