Was I having astral Projection? Out of body experience?

Today at school in the afternoon after lunch, I decided to skip my next class, and I actually did. During class time teachers, security and principle don't allow students to skip class. And if they get caught, they get a referral. I was not actually hiding in the bathroom. I was actually walking in hallway for almost an hour. The funny thing is that no security sees me, even when I pass by right in front on their faces. I even walk out of the school in front of the principle and he didn't even see me. I thought I was Dead.