I went on camp and got veggie lassagne for dinner. Another friend of mine put herself down as veggie in the hope that the food would be better (it wasn't, but I don't mind camp food while she objects vehemently to it). So, she gave her portion to me, and one of my other friends asked if she could try it. She did, and liked it, so we split it
. I found that quite heartening. People seem to be willing to listen at my school, and accept veggie food as actual food and not necessarially disgusting. And some of the nicest people are commonly known as veggie, including some of the nicest teachers that you can't help but like.
I was also very happy when a meat eater said 'I didn't know you were vegetarian!'. When I said, 'I'm getting there,' her immediate reaction was: 'That's awesum!'
And I got my food early and got to cut in the line
Probabally the best way is to be seen enjoying your food and not treating it as a big chore. Then, people can see how happy it can make others, and will be more open to it. Don't force beliefs onto them, because that's when people will reject you.

I was also very happy when a meat eater said 'I didn't know you were vegetarian!'. When I said, 'I'm getting there,' her immediate reaction was: 'That's awesum!'

And I got my food early and got to cut in the line

Probabally the best way is to be seen enjoying your food and not treating it as a big chore. Then, people can see how happy it can make others, and will be more open to it. Don't force beliefs onto them, because that's when people will reject you.