CPR on friend. Scared for life.?

So last week i was at my friends birthday party. She was having a great time and her mom was outside. She collapsed and wasnt breathing. I was the only one who knew how to do CPR and she did live. But i did CPR for 10 min. i am scarred for life but i am sort of wanting to be a paramedic now. Does anyone have any videos i could watch of cpr or cardiac arrest. Good and real video. Or any way to get this picture of my friend dying out of my head. (doctors said she went into cardiac arrest). Thanks so much.