Ee pray Confiteor, which sounds like this in English.
It's hard to say I'm sorry for my sins if I've committed them just recently. It would feel like a lack of self control or real instability to sin and be aware of doing so, then 30 minutes later be all sorry for it. I'm not.
On Sunday morning, I get a morning wood and fap. Then go to church. Can I say I'm sorry for my sins? While still feeling the post nut clarity, the emptiness in my balls, still remembering the pleasure? I can't. For procrastinating three hours yesterday, sure, but for this?