My mom caught me masturbating?

I am 13 years old and I've been masturbating since I was 11. My mom caught me masturabting while watching porn today. She grounded me for a week and she is soo mad! I've never seen her this mad before, and I'm really embarassed.
What should I say or do to fix this?
Update: a few people on here said that its better then doing the real thing, but i have done the real thing, but my mom doesn't know that
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