I am trying to learn more about the history of vegetarianism, are you vegan by any chance?
I'm vegetarian! The practice of not eating meat has roots in ancient Indian and Greece civilizations. 
OK and it means not eating meat but what about eggs cheese or milk?
Some vegetarians will eat milk and eggs ad even sea animals like fish. 
What about shellfish?
Shellfish
Shellfish is a colloquial and fisheries term for exoskeleton-bearing aquatic invertebrates used as food, including various species of molluscs, crustaceans, and echinoderms. Although most kinds of shellfish are harvested from saltwater environments, some are found in freshwater. In addition, a few species of land crabs are eaten, for example "Cardisoma guanhumi" in the Caribbean. Shellfish are among the most common food allergens.
Despite the name, "shellfish" are not actually fish, but are simply water-dwelling animals. Most
List of vegetarian restaurants
This is a list of vegetarian and vegan restaurants. Vegetarian cuisine refers to food that meets vegetarian standards by not including meat and animal tissue products. For lacto-ovo vegetarianism (the most common type of vegetarianism in the Western world), eggs and dairy products such as milk and cheese are permitted. For lacto vegetarianism, the earliest known type of vegetarianism (recorded in India), dairy products such as milk and cheese are permitted. The strictest forms of vegetarianism are veganism, raw veganism,