I'm 19, all through high school and even now, I slept for about 6 hours. If you feel like crap in the morning, take a shower. 10 minutes of your time wakes you up instantly. I'm so used to it now, that if I don't shower in the morning, I can't open my eyes until halfway through the day.
Let's be realistic, it's really hard to find a person that gets 8-9 hours of sleep every night. Most get 5-6 and some even less, and some only get naps because they wake up randomly in the middle of the night. Suck it up, when you get a job, it's going to be worse or the same.
Take a shower, go for a run, or drink coffee if you want, that's how I get through my 5-6 hours of sleep.