As someone who was diagnosed with ADHD at the age of two and have dealt with it my entire life I gotta completely agree with you. The quest for quiet is impossible. You will never have completely stimulus free environments. The way our bodies work competes against this whole idea. If you're in a dark room your eyes adjust. If you are in a quiet room your ears basically have a compressor built in. Everything that was in the shadow or in the quiet will eventually make itself known. Thrive in noise, thrive in distraction, thrive in chaos.

Edit: but one thing that is incredibly important is partitioning your workspace. Perform work where work should be performed and keep that separate from where you automatically do leisure activities or seek out pleasurable distractions.