Vegetarian.........HELP!!!?

I have been a vegetarian for almost a year. Not a long time. I am only 14 years old, and I don't know what to do. I mean I don't want to quit beeing a vegetarian, it is cool. My little brother shoves meat in my face, so I punch him. When ever I see meat i almost puck. All I eat for dinner is toast, rise snakes, or sometimes a sandwitch when my family has meat. I have lost a lot of weight this last year. Now I am under weight. What can I eat for dinner when my family is eating meat for dinner????? HELP!!!