I'm 12 years old and I don't know my weight because I really don't want to know how bad it is, I'm fat and I had Kawasaki Syndrome as a child. I'm a VERY picky eater but I like my veggies, I'm a vegetarian- basically because I hate the taste of it but I haven't replaced the meat with other foods! All I really want is to wear something and be confident like my mates! Please someone awnser my question and tell me what I should eat or do?

If you don't know your weight, how can you possibly know you "need" to lose some.
You are still in your developmental stages and as such any weight control plan needs to be carefully monitored by professionals.