You learned early that anger was something to manage. To suppress, redirect, or apologize for. To keep out of sight because it made other people uncomfortable.
Anger is not a character flaw. It is information. It tells you that something important to you has been threatened or violated. That a boundary was crossed. That something unfair happened. That you have been treated as less than you are.
Suppressed anger does not disappear. It resurfaces as resentment, as passive withdrawal, as depression, as a persistent low-level irritability that makes no sense to anyone including you.
The problem is not the anger. The problem is what you do with it, or more accurately, what you were taught not to do with it.
Anger acknowledged is useful. It points at something that matters. Anger denied becomes something else entirely.