Have you ever followed someone home? Have you ever been blocked on facebook and created a new account just to try to be friends again with the person who blocked you? If you said yes to any of these questions, you might be a stalker!
Ok on a more serious note, have you ever exhibited stalker like tendencies? Be honest ATRL.
Any time i'm at the mall or the super market and see a guy with a nice butt I start following them and pretend i'm walking the same way.