Do you live part time at all? Even when no one is around? When I was a young college student, I found that I was not always as successful at concealing my part time life as I thought.
For example, in two different living situations, it turned out that house mates were able to see into my private room. One was a hole in the wall I never was able to find, and the other was a vantage point on a nearby hill that allowed them to look over my curtains. So they actually saw how I lived at home.
Another time, I woke up late for class after a night of drinking and threw on some clothes and rushed to school. I arrived just in time, and when the professor commented in disgust that I looked like I was about to go before the draft board, I realized I still had my makeup on.
Another time a friend commented on some light traces of makeup that I missed when removing it. I mean, I was putting makeup on and taking it off three times a day back then. It was hard not to make a mistake at some point. It's kind of ironic that I don't even wear makeup anymore.