I go to school too.
Cut it out of your video game time or something. Drawing is a thing that you have to invest a lot of time into, and if you don't invest that time, no one will ever care about your work, and your work will never get better.
TIME FOR ACCEPTANCE.
Besides cutting it out of your other activities shouldn't be an issue if you truly enjoy drawing. Also, the more you draw, the faster you'll get, so it's not a long term thing.