As the Target of a workplace bully Stop listening to the bully's lies and verbal assaults. You did nothing wrong. You need not feel ashamed. Break through your fears for one week at least.
Procrastination ensures an outcome worse than the most feared.
Assert your right to be treated with respect regardless of who you are and where you rank Demand it directly from the bully whenever you interact. You owe it to yourself. Document the bully's misconduct. Break the silence. Learn all you can about why this happens and how to stop the hurt and how to topple tyrants at work.