Are you getting enough sleep? Sometimes that leaves people feeling listless, and not into doing anything. That aside, nothing gets done if you don't do it, so go do something. Eating too little also leads to feeling listless, so eat, and include some healthy foods. How about some mood and energy boosting, yummy fruit?
- Exercise, it releases mood boosting endorphins.
- Read funny stories or watch funny shows. That also releases endorphins.
- Do some chores. It will make you feel better to get some stuff done, and it will please your grand parents.
- Volunteer. There are people out there worse of than we are, and it will make you appreciate what you have, and boost your self image.
- Take courses, either in person or online. Some of the online ones are free.
- Take up a hobby.
- Join a club.
Now go and do something, and don't forget to eat and get enough rest, too. 
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If a man does not keep pace with his companions, perhaps it is because he hears a different drummer.
Let him step to the music which he hears, however measured, or far away.--Henry David Thoreau