I don’t feel anger. So, I don’t need to forgive my father for ignoring me while I was growing up, right?
You do not have to feel anger to forge ahead with forgiving. For example, are you feeling disappointed or sad? Do you think you can have a genuine trusting relationship with your father now? If not, then forgiving would be appropriate. In other words, it is not only feelings of anger that motivate forgiving. If you think you have been treated unfairly and this is getting in the way of your current relationship with your father, then forgiving would be appropriate if you choose to do so.
For additional information, see Forgiveness Defined.