I have dated vegetarians, and been friends with vegetarians. I also dated someone who tried Weight Watchers. The only ones who are thin are the ones who were already thin, and they look super pale and unhealthy and seem to lack any/all muscle tone. The ones who aren't thin tend to continually put on weight, but their ideas of ethics and morality blind them to the fact that their diet sucks.
It's good that you feel you should make the effort to eat grassfed meat. Just don't fall down the slippery slope. A vegetarian guy I dated used to have anxiety attacks and existential self-loathing whenever he ate cheese. He liked cheese, but all he could think about was the poor cows with their infected udders mooing mournfully, etc.
In the same vein: Sometimes I throw out bottles or cans that I could recycle. But they have dried stuff in them and I don't feel like washing them out. Sometimes I feel like a terrible person because I *could* save the planet, but no, I'm apparently too lazy.
Just do what you can when you can, and don't freak out about what you can't. Feeling bad about what you can't do doesn't make you a better or happier person, it just rips down a good and healthy person who tries to do the right thing. Give yourself a break.
And don't worry so much about veg*ans saying how they "eat clean". Anorexics say the exact same thing, and you wouldn't want to emulate them or feel bad that you're not starving yourself, right?