Veggie Sandwiches:
Mix and match breads (sliced bread, french bread, bagel, what ever) with some veggies, fruits, and favorite cheeses. You can have a savory sandwich (like pumpernickel bread with cheddar cheese, tomatoes, and bean sprouts) or a sweet one (a bagel with cream cheese and sliced strawberries)
Salads:
(no need to explain here... right?)
Chopped veggies:
Dont just do carrot sticks, go crazy with it! There are VERY few veggies that are not suitable when raw. Experiment around with your favorites
Avocado bowls:
When you slice an avocado in half and pop out the seed, viola, you have a perfect, tiny, delicious little bowl. Fill it with tasty things and consume! (salsa, cottage cheese, whatever you dig!)
Rice bowls:
Make a layer of rice in the bottom of a bowl, then put layers of stuff you enjoy. It may be a mexican rice bowl with veggie salsa, lettuce, cheese, or it may be a curry bow with vegetarian curry and yogurt, it may be an asian bowl with stir fried veggies on top or tofu or anything you like!
As a vegetarian eating fruit parfait with granola for lunch every day is NOT healthy unless you are getting super varied and filling breakfasts and dinners. Also, since you are in high school, you need to be very careful about getting proper nutrition both as a youth and as a veggie. Make sure you get enough protein and calcium. I highly suggest nuts and beans for the protein. Peanut butters, almond butters, dairy products, eggs, whatever you allow yourself to eat, eat plenty of it. Lean dairy might be a good answer so you dont get too many calories off it. Just remember that even though you are in high school and almost grown up, your body isnt quite done yet on the inside. Your muscles and bones arent done developing, and its a critical time for them if you want to be a healthy person in 30 years! (or now for that matter!)
You may want to talk to a health professional like a doctor or school nurse, or look up some good resources on the internet for dietary suggestions. And there is nothing wrong with being a veggie at your age, it can be done, you just have to do it right.
Good luck!