You don't behave your way into change; you think your way into change.
Romans 12:2
"Do not conform to the pattern of this world, but be transformed by the renewing of your mind. Then you will be able to test and approve what God’s will is—his good, pleasing and perfect will."
Changing old patterns or habits takes time and renewal is a process. This is why it's so important to spend time in God's word as He shapes and bends our will, thoughts, and emotions to be more like Him.
What old pattern or habit are you trying to change right now? What thoughts or beliefs might need renewing first for real transformation to happen?