I became a vegetarian in my early twenties. My family is omnivores, but the only fish we ever had at home was canned tuna, because no one at our house liked any other seafood. I have tried fish and chips, which was OK, but kind of weird to me. And I had tried shrimp cocktail at a restaurant, but that had a super freaky texture.
My family did, and still does eat meat. When I was a kid, I was super picky, and the only meat I liked was turkey, which we only had on Thanksgiving, and hotdogs, which was a treat that was only eaten on cookouts at the beach, which was a fairly rare occurrence.
I did not eat any other kinds of meat until I was about 15, and my picky palate started to go away. But at that same time, I was becoming very aware of “where food comes from” as opposed to knowing, but really not caring, and I became uber-sensitive and aware of animal rights issues around that time.
I made several attempts at vegetarianism, that failed, in my teens. I ultimately became a successful vegetarian, after becoming close friends with several people who had been vegetarians for many years, who helped me navigate the meat-free world without my parents thinking I was an anorexic, which I think is what they suspected was going on in my early teens, because I was relatively thin.
But I was, and am, about as far away from being an anorexic as one can be, because I have always apppreciated eating, and luckily, I have remained thin.