The ego needs you to feel guilty and unworthy in order to keep you in its limited world of the past and future, where it is in control.
Guilt and blame are two of the main strategies of control. It is also the way we avoid living in true responsibility.

If I can blame someone for the way I feel or for what is happening in my life, I can avoid taking responsibility for myself. Some one else is to blame. If I can make some one feel guilty, it is easier to control them and have them assume responsibility for me. It is nothing but a strategy to control others and avoid responsibility for our selves.
It is the same with unworthiness. If you feel unworthy, you will not be in your true power and so you will be easier to control. (From The Daily Guru, March 12,2004)