It is the job of conscious rational thought to decide what you want, select the goals you wish to achieve-and concentrate upon these rather than upon what you do not want. To spend time and effort concentrating upon what you do not want is not rational.
Emotions like guilt and shame cut you off from web of existence and that causes inflammation in the body. I would recommend that you go to a level of awareness where you can be an observer of your thoughts and emotions and use mindfulness.