Drawing from Above

I'm slowly getting a bit more confident with having my camera out in public, and I'm trying harder and hard to get myself used to taking photos around, and of people. This guy didn't know I was there, nor could he hear me (he had headphones on... I did check) but that doesn't really help. I gotta get into a mindframe where I am the photographer, and how people interpret my actions has no impact on me whatsoever. There's 40000 people at my school... They wont remember me.