Get yourself a backrest pillow maybe. You probably spend a lot of time sitting and the backrest will save you from back pain and other back issues that form over time due to excessive sitting.
I might actually look into this.
Funny enough i dont sit around as much as you would think. Got a lot of after school commitments. I get home around 9 PM usually!
If not now, you should probably invest in one later on. Sitting is far more dangerous than people think and can result in serious problems. Stay healthy!