This might not be the answer you want to hear; I recommend that you continue to wash your scalp every day. Experiment with CWC or CO if you'd like more gentle washes, but now is not the time to try to skip a day between them.
As a previous poster stated, hormones during the teenage years result in your skin producing even more oil than normal. If your skin previously tended to be oily, my guess is the current level of oil production is more a stage-in-life thing than an "overwashing" issue. Especially with your ends being fine with your current routine, I'm not sure why you're trying to stretch time between washes.
Let me back up a little. It is, generally speaking, good to stretch washes. Your hair is weaker when it's wet. Water causes the hair to swell a little, and over years, that can start to take a toll on aged hair. As your hair gets long, it takes longer to dry.
You've got a couple things against you right now when it comes to stretching out washes, though. You tend to have an oily scalp. You're at an age where oil production is heightened. You're probably going into a more stressful stage with first-time college starting. Your hair is not that long, yet, so you can't just sleek it back into a ponytail or bun.
Now, on the bright side: All that oil means your hair is protected when you wash it. Your ends are not getting dried out with your current routine. Your hair is not that long, and therefore, not very old, yet. Washing it daily for a couple of years isn't going to damage it. By the time you'd need to give it a thought at all, that hair of yours will be long enough to sleek back into a 'do, and then you can experiment with cutting back on washes. (Your body might not be quite so intent on producing as much oil by then as an added bonus.)
Have patience with the idea of skipping washes. Do other good things for your hair over the next couple of years, then maybe think about stretching time between washes.
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