Holding on to anger can be a way of feeling in control when others treat you in such a way that it is all too easy to feel out of control. Also, the anger can give a person a sense of power, specifically power over others. Further, anger can become a habit, even if this is unintended. This habit can be very hard to break. Forgiveness has been shown scientifically to break this habit of anger.
You just made a distinction between power **over** and power **for.** I will take power **over** all the time because this power **for** others usually results in my being taken advantage of. No thank you. I am better off being the one in charge.
Your trust seems to be damaged. If so, this idea of power **over** others may be a defense mechanism to aid you in not being hurt again. Am I correct about this? If so, then your quest for power **over** others will not heal your inner wounds caused by others. Of course, I could be wrong about this, but please introspect for a while to see if you have unresolved inner wounds in need of healing. Please write back if you have new insights.