Anger is an interesting emotion because it’s hot and comes on fast- normally it also dissipates rather quickly.
What happens if you hold onto that anger though?
You could use it to power you & make you work harder. Or unchecked it can eat away at you & make you bitter.
You can choose the path of course. It is a choice. The real question is what happens when holding onto that anger no longer serves you?
The target of your anger is probably unaware that you’re holding onto it. So they are unaffected by it.
At some point when holding the anger becomes destructive to your life & relationships - you’ll have to make the choice about what to do about it.