You are the Grudge Bookkeeper
A dogged avenger who calls it justice and collects every debt alone.
What kind of villain
You see yourself as a 'judge.' Taking orders from no one, you manage the ledger of those who owe you and settle it one name at a time. Your method is meticulous and deliberate, but the targets always stay within personal grudges. Your revenge is far too private to judge the world. Still, a name once entered in your book is never erased — making you a quiet but relentless avenger who never forgets.
In everyday life
When someone crosses a line you've drawn, you don't protest loudly. You quietly add them to an inner list and begin easing the distance open. They may realise one day, without ever knowing what they did wrong, that you've drifted far away. Once you've closed your heart to someone, it rarely opens again.
Similar characters
Syndrome from The Incredibles, the grudge-holding office boss.
Advice
Knowing your own boundaries and holding them firmly has been a grateful shield, keeping you steady against the world's rudeness. But cutting someone off in silence, with no warning, lets slip both their chance to apologise and your chance to clear up a possible misunderstanding. Before you quietly erase a name from your ledger, what if you said it out loud, just once, honestly and kindly? "To be honest, what you did back then hurt me a little." That one warm sentence has saved and deepened more relationships than you'd imagine.