I am a vegetarian. 
Vegetarianism is the practice of abstaining from the consumption of meat (red meat, poultry, seafood, and the flesh of any other animal), and may also include abstention from by-products of animal slaughter
I just don't eat meat because it is repulsive to me. Who eats animal flesh?
Why do you think its repulsive?
I'm not sure. I used to eat it and then it started to repulse me. 
Yeah, I could see that. I try not to think about it too much
Are there any health benefits to being a vegetarian? 
When fortified, a vegetarian diet can provide adequate protein, iron, zinc, vitamin B, and calcium intake
Does it prevent any diseases? 
I'm honestly not sure.