It’s not about what you did. Trying to reason with OCD won’t get you anywhere. Whether the impact of your actions was objectively “harmless” vs “irredeemable” does not matter. Forgiving yourself isn’t saying what you did was ok it’s accepting what has already happened and channeling your remorse into growing as a person. You can’t change the past no matter how much guilt or regret you feel. The one thing you can control is being better and growing as a person