When i see meat on a plate it makes me sad?

Sorry, but that is a thoroughly awful reason to be a vegetarian. Man is the only predator that actually makes any effort to kill its prey in a merciful manner, or for that matter insists on its food actually being dead before being eaten. All other predators inflict injury on their prey with the effect that the suffering causes the prey to weaken until the predator is not at risk when it eats the weakened or dead victim.