How does eating meat on Friday become a sin?

please explain how do eating meat on friday become a sin? i am a catholic and i am not able to take it.

The following links should assist you in better understanding the Catholic Church’s teaching on the Friday abstinence guidelines. If you have any further questions or concerns that are not answered by these links, please contact Catholic Answers directly.
Recommended Reading:
Where can I find a history of Friday abstinence from meat?**
*]Why is Friday for not eating meat and not another day of the week?
*] Required? (This Rock: January 2005)Is Friday Penance

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