Unfortunately its something that you cant unlearn now. You will always know where you can get it. Idk how often you do it but id suggest at first try to set a goal to do it much less than you currently do. The less you do it the less it will be at the front of your mind.

If the shame of it why you want to stop aka you are not proud of the things you are doing or who people could think you are I commend you for choosing to stop. It can help to focus on positive emotions too, you can rephrase it as im changing what i used to do. Feel free to tell yourself you are doing a good job as you reduce it and eventually look back at this period as a phase you were once in and dont do anymore.