We've had a few other threads about getting a good variety of meals so that you don't get too bored. Have a look at those and see how they might work for you.
I can tell you that I'm happiest, and feel least hungry, when I get some dairy and some fruit at the start of the day (breakfast, late morning snack), and a little protein and vegetables during the later half of the day (late lunch, dinner). You need variety in ALL your meals, not just lunch!
Breakfast ideas:
Cup of yogurt and a banana
Cereal with strawberries and skim or low-fat milk
Half a grapefruiit and a cup of yogurt
Apple and some sliced low-fat or non-fat cheese
Mid-Morning Snack ideas; mix and match fruit, dairy, and/or grain idea:
Another piece of fruit, not the same kind as at breakfast
Cup of yogurt
Weight Watchers english muffin, toasted, if your cafeteria has a toaster
Sliced non-fat cheese
Lunch ideas:
Tuna sandwich on a Weight Watchers english muffin (the muffins are 1 point as opposed to 4 for a regular one -- way less calories and fat, way more fiber)
Turkey wrap with lettuce or a whole-wheat tortilla
Chicken salad made with low-fat or non-fat mayonnaise
Thanksgiving Special: a salad with chopped or shredded leftover turkey
Sliced veggies and some Oasis Zero Fat Hummus
Dinner ideas:
Since you're still living with your family, this may be where you have the least leeway. But ask your parents to buy whole-wheat pasta instead of white pasta, lean meats and fish instead of the fattier stuff, loads of fruit and vegetables.
Forego the chips, candies, and other junk foods -- for the most part. But that doesn't mean you should deny yourself those foods, either. If you feel denied, you'll only go off your good nutrition plan that much faster. Instead, indulge yourself just a little bit every day or two. Allow yourself ONE big indulgence per week: a candy bar, a cup of ice cream, a SINGLE-SERVING bag of potato chips, a (skim, no whip) caramel latte at the coffee shop, a slice of pie. Also, allow yourself one small indulgence every day or two: three Hershey kisses, three hard candies, a small handful (about ten) chocolate covered espresso beans.
Full-sugar soda pop may taste good, but so does Coke Zero, and it won't wreck your good nutritional plan (some people call this a diet, but I hate anything with 'die' right in the word). Full-sugar, full-fat lattes may be tasty, but so does the same latte when made with skim milk or soymilk and sugarless caramel flavoring. Pizza is great -- but do you need to eat the whole thing? Get a veggie pizza (because pizza places do not use lean meats, but the fattiest stuff they can get their hands on) and have one or two slices. As with all 'treat' foods, remember, one bite is for taste, and the rest is for your waist (and is a waste).
Finally, the exercise issue. Do you really need to be picked up before 7pm? Can you hang out at the Y, doing your homework, until your mom can pick you up?