You could talk to your parents or perhaps a doctor about working out a healthier food plan. While it's true, most of us just eat crap simply for the sake of convenience(I'm every bit as guilty as you are),it doesn't mean the healthy choices can't be just as easy if not easier.
A few suggestions
Cut up pieces of fruit in a plastic container as a snack
Plain yogurt
Cubes of cheese with grain crackers
Cut up pieces of vegetables with dip
Trail mix or nuts and dried fruit
Granola cereal
Lean meat and/or fish
Multigrain bagels
Instead of pop, try various fruit juices, bottled water and iced green tea with lime juice.
If your parents are worried you may be too thin, you could tell them that you need to work on adding muscle to your frame not fat.
A few suggestions
Cut up pieces of fruit in a plastic container as a snack
Plain yogurt
Cubes of cheese with grain crackers
Cut up pieces of vegetables with dip
Trail mix or nuts and dried fruit
Granola cereal
Lean meat and/or fish
Multigrain bagels
Instead of pop, try various fruit juices, bottled water and iced green tea with lime juice.
If your parents are worried you may be too thin, you could tell them that you need to work on adding muscle to your frame not fat.