What should I do? please answer!!!!!?

I have been a pesco-ovo-vegetarian (which means i can eat fish and fruit and vegetables, and not eat meat and dairy products) for a little over a month now. I feel a lot better than i did when i ate meat. My friends have been really rude about the whole thing though. They always order a pizza with all pepperoni, or make milkshakes right in front of me. I usually bring my own food, like dried fruit or something in my bag so i dont starve, but it gets annoying. I always ask them to order half of the pizza with all veggies, or make milkshakes with soymilk but they refuse. I dont know if they are being rude, or i am being extremly picky...please helpppp