Hi Lex, I have to admit I have the opposite problem - my family was omni growing up, and my mom loved to cook - and always had some kind of meat thing in the oven. When I visit my parents' house now, I always seem to associate the food smells with growing up, holidays, and good, homey warm and fuzzy feelings. It never seems to register with me that those food smells are most likely meat! (When she takes the roast or whatever out of the oven and I actually SEE the meat, however, it's a different story...)
I'd suggest carrying around some veg-friendly mint gum or mint candies and chewing on one every time you start to get grossed out by meat smells in your vicinity. Hopefully the minty-fresh taste will overpower the dead animal stench. Being around meat doesn't seem to be something veg*ns really get over.... but we just learn to "zen" it as best we can in order to live in our very omni society.
And BTW --- I think you're awesome for the report you gave to your class. Much respect to you for standing up for what you believe - even if people made fun of you for it. It gets easier as you get older, I promise -- there will always be ignorant people who like to challenge your ethics and decisions, but you will also encounter more people respectful of your beliefs. Hang in there and just know that you're not alone!