How can I keep myself from getting distracted?

My achilles heel in my school life has always been my inability to stay focused on a task unless I remove all excess stimuli around me and eliminate all distractions. However, I can’t end up doing all my work in a large, white room. I need to train myself to focus more on what I’m doing when there are things going on around me. How can I go about finding my focused state of mind?

P.S. I know I don’t have ADD or ADHD