When you're homesick, you might feel nostalgic for familiar things like your family, friends, pets, house, or neighborhood. You can miss something as simple as your bed or the tree outside your window.
Homesickness isn't only for kids: Practically everyone feels homesick from time to time, even adults. Teens might get homesick when they leave home for the first extended period of time, like during a vacation with a friend's family or a summer job as a camp counselor. Going off to college is another common trigger.