How to not feel guilt for standing up for myself?

[Beatrix]

You need therapy, beut meanwhile you need to avoid anybody who diminishes you. You need to avoid any bully in order to allow your self-esteem to start healing. Emotional violence is akin to physical violence: every time the bully diminishes you, it's like they'd punched you in the face: you would not accept any "friend" who punches you in the face, so why do you accept a bully to insult you. The damage is actually much deeper when it's emotional abuse.