I'm doing my best to get over feeling ashamed, sad and guilty

I was teasing someone a lot in a game I play. I really thought this person had a hide like a rhinoceros and wouldn't be offended or hurt.

Wow, was I wrong! The person said he was thick-skinned but not hard. He kinda read me the riot act about how the jokes were not funny and how I missed a cue (which I really did). I apologized profusely and sincerely and STILL feel like pond scum. I just am not a person to hurt feelings, especially on purpose. I just am not that way.

I know there's nothing you can say, really. I need to learn my lesson (which I have have, in abundance), let it go and go on. Wow, lesson learned.