Others may have done things in the past to make you feel angry, victimized, unappreciated, and used. Indeed, you may have a valid reason to feel anger.
You may have been taken advantage of and victimized by others. You may have been unappreciated by others. You may have been used by others. These are common experiences of just about all people.
However, when these kinds of occurrences happen in life we have a choice to make. We can choose to be drawn into the darkness put upon us by others or we can choose to stay out in the light and love of Christ.
If you are truly a child of God, others may try to do things to make you angry but you do not have to respond or feel angry.
In Christ, others may try to victimize you but you do not have to be a victim. In Christ, others may not appreciate you but you do not need the appreciation of others.
In Christ, others may use you to their advantage but you do not need to feel used because you have given over all of who you are to Him who died for you.
The power we live under in Christ is an insulating power for our hearts. This insulating power keeps us from feeling angry, victimized, unappreciated, and used by others.