As a very young child you were empowered. You knew what you wanted, you knew what you did not want and you knew how to express it very clearly. But your parents were not present. They did not respond to you in the way that you needed. And so you expressed anger, sometimes in the form of a temper tantrum.
It was your attempt as a child to be empowered and get what you wanted. You were very powerful but your parents were bigger. They won the battle of wills and as a result you acquired two very limiting beliefs about yourself - you cannot have what you want and you have to accept what you don’t want.
As a child, your anger was an attempt on your part to assert your power. But as an adult, anger is a sign of powerlessness. It is an indication that you still believe that you cannot have what you want and that you have to accept what you don’t want, and you are angry about that.
You are still governed by those limiting beliefs. Although those limiting beliefs were true for you as a child, they are no longer true. You have to reclaim the power that was taken from you as a child. Simply ask for what you want or state clearly what you don’t want in a clear and loving way, but the key is to not be attached to the outcome.
In the world of time, sometimes you get what you want and sometimes you don’t. True power has nothing to do with getting what you want. True power exists in knowing what you want and what you don’t want and expressing it clearly and lovingly, without attachment to the outcome.