The more someone fights against their stutter, the more they try to hide it, avoid words, people, certain situations, the worse their stutter gets. This is because when someone stutters, their brain is already producing too much tension in the speech muscles. If they struggle against that, they add even more tension which can lead to severe blocks. If they learn to relax instead of fighting against their stutter, they will be more fluent. Nothing about this is easy or simple. Stuttering usually starts in childhood so by the time someone reaches adulthood they had thousands of opportunities to develop ingrained negative thought patterns and behaviours around stuttering. If you are determined to want to improve your stutter, I would strongly recommend finding a Speech and Language Pathologist who specialises in stuttering and can teach you techniques and help you to incorporate them into your daily speaking habits.