Change is nothing more than the formation of a series of habits. Look at your life as it is right now. Most of what you do, what you think, and how you behave is habitual.
Yes, there are small differences in your routine, but rarely do you insert some sustained, on-going activity or new way of doing something.
You have developed the patterns of your daily habits over many years. Some you carried from childhood, and others you picked up along the way. But most of your daily habits have been repeated enough times that your brain circuitry is entrenched in these behaviors.
To change the behaviors, you must rewire your brain. And rewiring your brain takes practice, patience, and the knowledge of how to do it.