My interpretation of your question is that you are looking for ways that you can become less of an expense to your parents. While parents shouldn't ever look at their children as money pits, there are families that would greatly appreciate kids helping to support themselves and reducing the pressure on the overall family budget. As a tenth grader, you are old enough to be able to do a number of different things that can help.
Telling you to find a job is easy to say but may be hard to do in the current economy, so keep that in mind but also look for other ways to help. If you can get by with the same clothes, shoes, book bag, etc. that you used last year, that is a major savings. If you must get new-to-you things, use Goodwill or consignment stores to find used items that will cost much less. Think about the cost of feeding a tenth grader - if you cut down on expensive snacks and fast food in favor of healthier, less expensive homemade items you'll be helping their budget and your health. Obviously, this is not the time to ask for new furniture for your bedroom or other big ticket purchases. You could try finding more free or low-cost activities to share with your friends instead of asking for money to go to movies, the mall, or wherever you might have gone to spend time and money in the past.
Your folks may not say so, but they will appreciate your consideration!