Being different has taught me to be less judgmental. Vegetarians and tattooed peeps may be the norm for you, and it ain't no big thing. You might still think differently about people because of these two things, that they are different than you. Those are just aspects of the person.
There's a constant push-pull between what is environmentally "best" and what is economically sensible. So, how to make the world better, and do it in a reasonable way? To start, you should gather information.
A Practical Vegetarian is one who almost always eats plant-based food when that choice is available -- and when it's not, is open to eating whatever food is indeed available and does so with gratitude.