How do you know if you've committed a mortal sin?

At times i am not sure if a sin is a mortal sin. At confession the priest told me that you will always know if it a mortal sin

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*] How can I explain the Church’s teaching on mortal and venial sins?
*] What should I do regarding these scrupulous issues?
*] Am I being scrupulous?
*] How do I conquer scrupulosity?

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