Q.I am a 19 year old Muslim and want to know a hadith which states eating and drinking with the left hand is forbidden. My mother tells me to eat with right hand all the time and it is so hard for me to do.  Is it important to eat with the right hand?
A. You have two violations against you, oh 19 year old! One: Not listening to your mother. Imagine for a moment, there was no hadith mentioning anything about the benefits about the usage of the right hand. Then, too, you have to listen to your mother. Was she asking you to commit a crime? An act of injustice? Violate a law of the country or deen?

Regardless, here is the hadith that can clear up any doubt:
Volume 7, Book 65, Number 291: Narrated Anas bin Malik:  A tailor invited Allah’s Apostle to a meal which he had prepared. I went along with Allah’s Apostle and saw him seeking to eat the pieces of gourd from the various sides of the dish. Since that day I have liked to eat gourd. ‘Umar bin Abi Salama said: The Prophet, said to me, “Eat with your right hand.”

Volume 7, Book 65, Number 288:  Narrated ‘Umar bin Abi Salama:  I was a boy under the care of Allah’s Apostle and my hand used to go around the dish while I was eating. So Allah’s Apostle said to me, ‘O boy! Mention the Name of Allah and eat with your right hand, and eat of the dish what is nearer to you.” Since then I have applied those instructions when eating.

Additionally, amongst the many good things you can do whilst eating, here is one more good thing you can practice whilst eating:
Volume 7, Book 65, Number 290:  Narrated Wahb bin Kaisan Abi Nu’aim:  A meal was brought to Allah’s Apostle while his step-son, ‘Umar bin Abi Salama was with him. Allah’s Apostle said to him, “Mention the Name of Allah and eat of the dish what is nearer to you.”

Additionally, all good things should be done with the right hand:
Volume 7, Book 65, Number 292:  Narrated ‘Aisha: The Prophet used to love to start doing things from the right side whenever possible, in performing ablution, putting on his shoes, and combing his hair. (Al-Ash’ath said: The Prophet used to do so in all his affairs.)